An ultralight softshell with just a smidge of insulation, the Patagonia Nano-Air line provides a fantastic midlayer that moonlights as a shell in fair but cool weather. I’ve been wearing the Nano-Air Pullover for a year now and found its versatility makes it a very capable year round piece. 

The Patagonia Nano-Air Ultralight Pullover Review

• Shell & lining: 100% recycled polyester air-permeable ripstop with a PFAS-free DWR finish
• Lower arm panels: 100% recycled polyester double knit with a wicking finish
• Insulation: 20-g FullRange® 100% recycled polyester
• Weight: 247 grams
• Origin: Vietnam
• Size Tested: XL
• Tester Size: 187cm, 92 kg

What is the Patagonia Nano-Air Ultralight

The Patagonia Nano-Air Ultralight is the latest and lightest evolution of a line that redefined technical layering when it debuted in 2014. While the original version featured 60g insulation, this third-generation Ultralight has been slimmed down to a scant 20g of FullRange™ insulation. It provides just enough warmth to stave off a mountain chill without causing you to redline during high-output movement.

Essentially a DWR-treated, weather-resistant wind layer with a “brain,” this jacket is designed for moving hard and fast in cool conditions. Whether you’re skinning up a track or climbing a late-season alpine route, its featherlight and highly compressible design ensures it won’t hold you back.

The mechanical stretch moves effortlessly with your body, while the slim, streamlined profile ensures optimal performance—whether it’s tucked under a climbing harness or layered beneath a heavy pack. It’s the ultimate “start-to-finish” layer for high-intensity mountain days.

The Shell

The shell of the Patagonia Nano-Air Ultralight is crafted from a 30-denier, 100% recycled polyester ripstop. It’s remarkably soft to the touch and, perhaps most importantly for a mid-layer, it’s silent while moving. While the PFAS-free DWR finish puts up a fight against light moisture, it’s not a hardshell, expect it to lose the battle if precipitation falls for more than a few minutes.

Thanks to its mechanical stretch, the jacket moves exceptionally well with the wearer. It strikes a fine balance in the wind, blocking light breezes while maintaining the high level of airflow needed for high-output missions.

After a full year of testing through both summer and winter, the jacket shows only minor wear. There are large panels of Capilene Cool Lightweight fabric running from the inner elbow to the wrist, which provides incredible breathability and feels great against the skin—especially if you’re wearing it over a T-shirt. Because the sleeves are slightly long, I have noticed some minor pilling on these Capilene sections. However, after over a year of heavy use, this is exactly where I’d expect to see wear, and it hasn’t disappointed me in the slightest.

The Inner Lining

The insulation duties for the Nano-Air Ultralight are handled by 20 grams of FullRange™, a 100% recycled synthetic fill. Developed by the experts at Toray Mills in Japan, FullRange is a multi-denier insulation composed of various polyester fibers.

Unlike down, FullRange utilizes a blend of hydrophobic fibers specifically designed to repel moisture. This allows the jacket to maintain its warmth when saturated, and it ensures an incredibly fast dry time. Having sweat through this layer more than a few times in windy, alpine conditions, I can personally attest to its performance: even when damp, it continues to cut the chill and dries out remarkably fast once the output levels drop.

Features and Fit

The Patagonia Nano-Air Ultralight has a technical, slim cut, yet it still manages to fit somewhat large. At 187cm tall and 92kg, I found the XL to be a bit loose. However, for a high-output piece, I don’t consider this a negative; the extra volume encourages better airflow and provides a completely unhindered range of motion.

The pullover version features a two-way zipper, a clever design choice for temperature regulation. It allows you to zip open the bottom of the chest while keeping the collar secured. You can essentially treat this as a front-facing pit zip (actual pit zips are unnecessary here thanks to the highly breathable Capilene panels). This setup allows the collar to stay upright, protecting your neck from the sun or wind while dumping heat from the torso. While I didn’t find myself using this feature often, I do know some folks who are huge fans of this feature.

The chest pocket doubles as an integrated stuff sack, allowing the pullover to disappear into your pack or clip onto a harness when the intensity, or the temperature, picks up.

The Patagonia Nano-Air Ultralight: Not Just a Midlayer

I have worn the  Nano-Air Ultralight for a lot of winter and summer days. Its 20g of insulation is the definition of just right on high output cool endeavours, handling everything from crisp alpine starts to winter days where the mercury sits just below 0°C with total aplomb.

The standout feature is how the insulation and outer shell breathe in tandem. I’ve pushed this pullover into much warmer temperatures than Patagonia likely intended. It’s handled those classic mountain transitions where you start in a cool, shaded valley and finish under the intense heat of the midsummer alpine sun. Even when I’ve completely soaked the piece in sweat during a high-output push, it’s bone-dry and ready to go an hour after hanging it from the back of my pack.. 

As a standalone piece, the Nano-Air Ultralight is a premier three-season tool. When the snow flies, it transitions into a highly capable mid-layer for moderate winter days. Its featherlight, weather-resistant construction keeps you moving comfortably, while the stretchy, compressible design ensures it performs perfectly whether it’s tucked under a climbing harness or layered beneath a heavy pack.

Hit this link if you are interested in the Patagonia Nano-Air Ultralight in the USA. Hit this link if you are interested in picking up the Patagonia Nano-Air Ultralight from our friends at VPO.  

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BlackSheep was provided with a free sample of the Patagonia Nano-Air Ultralight for this review. This in no way affected our editorial stance. This post also contains affiliate links; if you choose to purchase gear through these links, we may earn a small commission which supports our independent testing at no extra cost to you.