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What Is Down Fill Power (2026): Fill Weight, Synthetics

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Updated February 2026: We’ve added a new section on caring for down and some notes on Outdoor Vital’s Zero Stitch fabric.

What Does Down Fill Power Tell You?

The higher the fill power, the greater the loft. Down puffer jackets and sleeping bags keep you warm by trapping the warmth coming off your body, retaining it in air pockets between the down. A higher down fill power means the down has more loft, which means there are more air pockets, which means that more heat is retained. If everything else is equal, that means that a higher fill power garment will be warmer than one with a lower fill power.

Unfortunately, everything else is never equal. Fill power alone is not enough information to know how warm something will be. There is no direct correspondence between fill power and how warm a product will keep you, because there are many other factors to consider, like how much of that fill is in the product, how well it can expand within the baffles or down chambers, how well does the fabric stop the wind, and so on.

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To know how warm a down jacket, sleeping bag, or comforter will be, you need to know at least one other number: the fill weight.

What Is Down Fill Weight?

Down feather winter jackets hanging by dark brown wooden hangers on a rack pole. The jackets are in multiples of yellow...

Photograph: Tatiana/Getty Images

Down fill weight is a simple number. It’s the amount of down in the product, usually measured in ounces or grams. Using down fill weight and down fill power together can give you way to compare two items. For example, the relative ability of a puffer jacket to retain heat can be estimated by multiplying the fill power by the fill weight. This means that a 900 fill power jacket with 2 ounces of fill weight will be able to trap about the same amount of heat as a 600 fill power jacket with 3 ounces of fill weight. The big difference between them, and the reason they are priced differently, is the weight of each and the packed size.

In jackets, the weight difference isn’t huge. This is why some of our favorite puffer jackets are 600 fill power. When it comes to sleeping bags, though, things are different. Since there is a lot more down in a sleeping bag, the weight difference between equivalent amounts of fill power is more significant. Unless your budget is unlimited, you’ll want to pay attention to the warmth-to-weight ratio. How much warmth do you need, and how much weight do you mind carrying?

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The one downside to down fill weight is that some manufacturers don’t list this. It sounds great to say your puffer jacket as 900 fill power down, but when you have to list that it only has 2 ounces of it, it sounds less impressive. Less reputable companies often don’t advertise the fill weight. We list fill weight of all the jackets we test.

Other Factors to Consider

Tan sleeping bag partially zipped up with the flap open to show the yellow interior

Courtesy of REI

While down fill power and down fill weight together give us a way to compare items, there are other things to consider to get an idea of overall warmth. The third major factor is the baffles, the compartments that are built into the product. If you just sewed up a single piece of nylon as a shell and shoved some down inside, gravity and movement would push it all down near the hem in a matter of minutes. To avoid this, garment makers add baffles to keep the down in place. Baffle type and shape play a big part in how warm your jacket, sleeping bag, or comforter ends up being.

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This Is Considered The Best Auto Parts Retailer By Customer Satisfaction

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Automotive maintenance and repair can get expensive, which is why many car owners prefer to do maintenance at home, at least the easy DIY auto projects. If you’re one of these DIYers, you may have dealt with a difficult customer service experience at your local auto parts store. Such experiences can cause delays, and make even the simplest job more challenging than it needs to be. If you regularly shop at AutoZone, chances are you might have nothing but good stories to share.

According to a January 2026 report from the American Customer Satisfaction Index (ACSI), AutoZone leads the way as the best auto parts retailer, based on customer satisfaction. In fact, the company improved over the prior year by 3%, which comes to a total score of 79%. This shift put the company ahead of O’Reilly Auto Parts, even though O’Reilly has a rewards program to help you save money. O’Reilly slid down to the No. 2 spot, from an 81 to a 76. Rounding out the top three is Advance Auto Parts, down from a score of 77 to 75.

The ACSI doesn’t reveal its exact formulas used for generating these scores. However, the organization does explain on its website that customer satisfaction is based on thousands of interviews with said customers. Those interviews are then fed into an internal model that records the key points of satisfaction, including customer expectations, perceived quality, and value. Those figures are then used to formulate a single score for each company reviewed, on a scale of 0-100.

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Customer feedback is mixed on AutoZone

Beyond its 2026 ranking in the American Customer Satisfaction Index (ACSI), AutoZone also performs well in reports from other publications. As an example, in Newsweek’s America’s Best Customer Service 2025 rankings, AutoZone placed third in the Online Retailers: Transportation category. The company has a total score of 85.65, behind RockAuto with an 87.05 and first-place Auto Parts Warehouse with an 88.25. Newsweek’s numbers are based on a large consumer survey conducted with Statista.

However, not all customer satisfaction reports have been positive for AutoZone, and that’s despite the fact that you can get some things for free at the stores. According to the 2024 Market Force research, via PR Newswire, NAPA Auto Parts ranked highest in overall customer experience, earning a score of 77.5%. This was based on several customer experience metrics. But NAPA is actually in the second spot for total customer visits, coming in at 18.3%, which is well behind AutoZone’s No. 1 ranking of 32.3%. So even though AutoZone had more customers overall, the study found that other automotive retailers performed better in customer experience.

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ConsumerAffairs shows a similar trend for AutoZone, as the retailer doesn’t display positive customer experiences consistently. According to reviews on the organization’s website, some of AutoZone’s  mployees go the extra mile to help, but that same level of service isn’t the norm overall. In fact, AutoZone has 2.4 stars out of 5, and out of 770 total reviews, 471 are one star only. So while some customers are pleased, many leave disappointed.



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The Amazon Echo Dot Max has dropped to its lowest price

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Smart speakers often promise big sound in small boxes, but few actually manage to fill a room properly, which makes this latest discount on Amazon’s most powerful Echo Dot worth attention.

The Amazon Echo Dot Max is now £69.99, down from its original £99.99 retail price, making the newest generation Alexa speaker significantly more affordable for anyone building or expanding a smart home setup.

For context, the Black Friday discount came in at £89.99. That’s a mere 10% / £10 off, with this new savings dwarfing that past offer.

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Amazon Echo Dot Max drops to its lowest price ever

The Amazon Echo Dot Max has hit its lowest price on record, turning this powerful little smart speaker into one of today’s standout bargains.

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The 4.5-star Amazon Echo Dot Max positions itself as the most capable entry in the Echo Dot family, designed to deliver noticeably fuller audio while still keeping the compact form that fits easily on shelves, desks, or bedside tables.

Unlike smaller Echo models like Echo Dot (5th Gen) that prioritise voice assistant convenience over audio performance, this version adds a dedicated 2.5-inch woofer and a 0.8-inch tweeter, helping it produce deeper bass and clearer vocals during everyday listening.

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That hardware works alongside automatic room adaptation, meaning the speaker analyses your environment and adjusts output accordingly so music remains balanced whether it sits against a wall, in a corner, or on an open surface.

Where the Amazon Echo Dot Max becomes particularly useful is in its role as a built-in smart home hub, allowing compatible lights, locks, and other devices to connect directly without needing additional bridges.

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Support for Zigbee, Matter, and Thread means the speaker can act as the central control point for many smart home ecosystems, letting users create routines, automate devices, and manage everything through Alexa voice commands.

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That practical integration becomes especially helpful in day-to-day routines, whether dimming lights for a film night, setting temperature-based automations, or simply asking Alexa for reminders, weather updates, or quick information.

Amazon has also added its AZ3 processor to keep responses fast, while Omnisense technology enables contextual awareness features such as presence detection and temperature-based routines that can adjust your home automatically.

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At £69.99, the Amazon Echo Dot Max makes a strong case for anyone wanting better sound and smarter home control without stepping up to a much larger or significantly more expensive smart speaker.

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If you are considering other Alexa speakers before deciding, it is also worth checking out our Best Amazon Echo 2026 guide, where the Echo Dot Max was awarded the best budget smart speaker, and a number of them are on sale today.

Improved bass, better overall audio quality and a Zigbee/Thread smart home hub built in, the Amazon Echo Dot Max might be more expensive than its predecessor but it’s a clear upgrade. If you want the best audio quality then the Echo Studio (2025) is a better choice, while those with the old Echo (4th Generation) will find that they have slightly better audio quality. However, for new users looking for an Alexa smart speaker that’s decent for music, this is the best all-rounder – it would be nice to see Alexa+ in the UK to really maximise its capabilities, though.

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  • Decent audio for the size

  • Full smart home hub

  • Ready for Alexa+

  • Doesn’t sound as good as the old standard Echo

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Brits admit they feel uneasy around robots and local data centers, revealing surprising distrust despite national technology support

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  • Over half of UK adults feel uneasy interacting with robots daily
  • Limited exposure drives anxiety, with only 30% of Britons ever meeting robots
  • Domestic robots spark the strongest reluctance, especially in home environments

More than half of British adults say they feel uneasy around robots, making the UK the most robot-anxious nation globally.

A survey by Hexagon across nine markets, involving 18,000 participants, found 52% of UK respondents were concerned about potential problems when interacting with robots.

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Nvidia GTC 2026 live coverage: All the news and updates as it happens

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Hello from sunny San Jose! I’m here and ready for the start of Nvidia GTC 2026 tomorrow – come back then for all the build-up to the opening keynote and much more.

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Building A Rad Bluetooth Speaker That Didn’t Really Exist

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[Nick] came across an awesome Bluetooth speaker online, only, there was a problem. It didn’t really exist—it was just a render of a device that would be nice to have. Of course, there was an obvious solution—[Nick] just had to build the device for real!

The key to the aesthetic of the build is the external case. [Nick] was able to recreate the rough design of the rendered device in SolidWorks, before having the components produced on a resin 3D printer which provided excellent surface finish. Internally, the Bluetooth audio receiver was cribbed from an old pair of wireless headphones. However, a little more oomph was needed to make the speaker really usable, so [Nick] hooked the audio output up to a small MAX98306 amplifier board and a pair of 3 W speakers. The tiny tactile buttons from the headphone PCB wouldn’t do, either. For a nicer feel, [Nick] hacked in a set of four hall effect keyboard switches to control the basic functions.

The result is a Bluetooth speaker that looks as rad as the rendered unit, only you can actually take it outside and bump some tunes! It recalls us of some fine up-cycling work we’ve seen done to vintage 80s radios in a similar vibe.

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Like a truffle pig for deals, I’ve sniffed out the top 55+ discounts in Amazon’s new Big Smile Sale

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Hello, Australia! And welcome to TechRadar’s live coverage of Amazon’s first big sale of the year – the Big Smile Sale.

We’ve had a few Big Smile Sales in Australia perviously, so we know a thing or two about it. It’s typically held in March — though this year the start date of Monday, March 16 is a touch earlier than 2025. It’s always been a week-long sale, so nothing new in the fact that you have until Sunday, March 22 to shop till you drop (figuratively speaking, we hope).

Don’t expect record-low prices on Amazon this time round, though — that’s typically reserved for the Amazon Prime Day sale and the Amazon Black Friday sale — but you’ll typically see about 20% to 30% off a range of items. There will be deeper discounts on select items, but it will be the rare offer that comes in at an all-time low.

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Grab Amazon's first material discounts on M5 Pro & M5 Max MacBook Pros

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After discounting the new M5 MacBook Air, Amazon is back today with deals on the brand-new M5 Pro and M5 Max MacBook Pro.

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Save on Apple’s newest M5 Pro and M5 Max MacBook Pros – Image credit: Apple

The discounts can be found below, with units in stock and ready to ship. These are the brand-new configurations that were officially released yesterday, March 11.
While the markdowns aren’t extreme, they do reflect the lowest prices available on the retail models per our M5 Pro and M5 Max 14-inch MacBook Pro Price Guide and M5 Pro and M5 Max 16-inch MacBook Pro Price Guide.
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2026’s EV Sales Hit 1.1M – But Europe Surges While North America Slides

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Europe’s EV sales for January and February spiked 21% from last year, according to new data from Benchmark Mineral Intelligence. Electrek reports that just in those two months over 600,000 EVs were sold in Europe.

And figures for “rest of world” (which excludes Europe, North America, and China) are up a whopping 84% — with 370,000 EVs sold in January and February. (EVs now represent more than 30% of the vehicles sold in South Korea.)

But for the same period China’s sales are down 26% from last year, with 1.1 million vehicles sold. And North America showed an even larger drop of 36% from the January/February figures in 2025, now selling just 170,000 electric vehicles, while Canada’s EV sales were down 23%. EV sales seem heavily influenced by government incentives, with Germany and France leading Europe’s growth:


EV sales in Germany are up 26% so far this year, following the country’s introduction of a new subsidy program at the start of 2026. France’s market is up 30%, supported by its existing incentive program.

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Italy is also seeing rapid growth. EV sales there jumped 23% month-over-month in February, making it the country’s strongest month ever for EV sales. The Italian market is now up 98% year to date. That surge follows the Italian government’s October 2025 launch of a new subsidy program, funded by the EU’s Recovery and Resilience Facility, to increase EV adoption. Households can receive up to €11,000 ($12,700) in incentives, while smaller businesses can get up to €20,000 ($23,200)…

[T]he global EV transition isn’t slowing, but it’s becoming much more uneven depending on policy, incentives, and trade rules.

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Brompton Electric T-Line Folding Electric Bicycle Review: Pocket-Sized Pedal Power

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Disappointingly, Brompton hasn’t given the T Line Electric any more speed for US-based riders, so I’m afraid you’re limited to the UK speed limit of 15.5 mph instead of the Class 1 pedal assist maximum of 20 mph.

I first came across the e-Motiq system in 2024, when I tested the larger 20-inch Brompton G Line. This powerful rear-mounted motor, which can hit 20 mph, offered a more stable ride compared to the front-mounted design, and being pushed definitely feels more natural than being pulled along. The redesign also keeps the weight at the rear, so the folding mechanism remains balanced.

There are three power-assist levels available here, plus Push Assist (more on that below), and the e-Motiq system also adjusts based on your own riding style. It monitors pedal force and cadence. How often you stop and start and over your first 62 miles on the bike tweaks how the power is used. This isn’t to eke out out extra mileage, but to make your ride smoother and more natural.

During testing, I barely noticed any changes as I racked up the miles, but I was seriously impressed by how normal the bike felt. Well, normal for a marginally wobbly upright design with tiny 16-inch wheels. Yes, there was a surge of power as I started to pedal, but the initial acceleration was controlled. It felt more like I’d supercharged my legs, rather than strapped a motor to my bike.

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My test bike was single-speed, but there is also a four-speed option available. Riding around London, I did not need more than one gear as the motor just takes the effort out of any hills. Endless traffic also means it’s harder to exceed top speed for long, but when the road did open, I was impressed by how easily it was able to transition between assisting and backing off the power to stick to 15.5 mph. I can only speculate, but on America’s bigger roads, I think I’d want four gears. I’d also want a boost in the speed assist limit. It’s a shame Brompton only thought to include one of those things.

I also rode a few miles without the battery pack, and was pleasantly surprised. It weighs less than my old steel Brompton, and feels much nicer to carry, too. I hauled the Electric T Line e-Motiq up countless stairs, onto the London Underground, slung it in the trunk of a taxi at 2 AM, and only left it in a restaurant cloakroom once. It is light and small enough to just carry with you, and it’s also expensive enough that you’ll never lock it up and leave it on the street.

I’ve also been able to ride the nonelectric titanium Brompton T-Line, which at 17.64 pounds, was almost laughably light. If you don’t need electric power, it is the perfect commuter bike.

Control, Extras, and Competition

Image may contain Machine Wheel Escooter Transportation Vehicle Tire and Bicycle

Photograph: Chris Haslam

It’s tiny, but the handlebar-mounted controller does some cool things. There’s a start-assist button, that if you press just before you set off at traffic lights, or hit a hill for instance, will give you a powerful push to get you started. It’s not a throttle—you need to be stationary though for it to kick in.

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Google, Accel India accelerator choses 5 startups and none are ‘AI wrappers’

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Many artificial intelligence startup ideas are still little more than superficial “wrappers” built on top of existing models. But as the AI model makers add more features, investors are wary of startups that could become so easily unnecessary.

Case in point: when reviewing more 4,000 applications for the joint AI accelerator for India startups run by Google and venture firm Accel, “wrapper” ideas dominated. But none of them were among the five startups for the latest cohort, Accel partner Prayank Swaroop told TechCrunch (pictured above).

Announced in November, the AI-focused Atoms program by Google and Accel aims to back early-stage startups building AI products linked to India. Startups selected for the latest cohort will receive up to $2 million in funding from Accel and Google’s AI Futures Fund, along with up to $350,000 in cloud and AI compute credits from Google, the firms said.

Roughly 70% of the rejected applications were “wrappers” — startups that layered AI features such as chatbots on top of existing software but “were not reimagining new workflows using AI,” Swaroop said.

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Many of the remaining applications that were denied, Swaroop said, fell into crowded categories such as marketing automation and AI recruitment tools, areas where investors saw little novelty. Startups in those sectors often struggle to differentiate themselves, he said.

This isn’t, perhaps, surprising. This year’s program received nearly four times the applications than previous Accel’s Atoms cohorts — with many first-time founders.

India’s growing AI ecosystem remains largely focused on enterprise applications and Swaroop said the applications reflected that. About 62% of the submissions focused on productivity tools and another 13% on software development and coding, meaning around three-quarters of the applications were enterprise software ideas rather than consumer products. (Swaroop had hoped to see more ideas for healthcare and education.)

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Jonathan Silber, co-founder and director of Google’s AI Futures Fund, said the five startups selected aligned closely with areas where Google expects AI to see deeper real-world adoption.

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The program does not require startups to use Google’s models exclusively, Silber said, noting that many companies combine multiple models depending on the workflow. The goal, he said, is to gather feedback from startups on how Google’s models perform in real-world applications.

Insights from those startups can then be fed back to Google DeepMind teams to help improve future models, creating what Silber described as a “flywheel” between startup experimentation and AI development. “If a company is using an alternative model, that means Google has work to do to build the best model in the market,” he told TechCrunch.

This year’s startups selected are:

  • K-Dense, which is building an AI “co-scientist” to accelerate research in fields such as life sciences and chemistry;
  • Dodge.ai, which develops autonomous agents for enterprise ERP systems;
  • Persistence Labs, which focuses on voice AI for call centre operations;
  • Zingroll, which is building a platform for AI-generated films and shows;
  • Level Plane, which applies AI to industrial automation in automotive and aerospace manufacturing.

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