What Our Gearhead(R) Experts Are Saying:"The helmet compatibility is real on this one - it's thin enough to fit without creating pressure points but warm enough that I'm not reaching for something heavier on cold mornings. The adjustable cuff is a small detail that actually matters when the temperature swings mid-day. I've worn mine under a helmet all morning and on its own for the walk back to the car, and it handled both without complaint."A good ski beanie pulls double duty without making a fuss about it. The Patagonia PowSlayer Beanie fits under a helmet on the first chair of a cold morning and looks like it belongs there at the bar afterward. The 2-ply recycled polyester yarn keeps bulk low enough to sit comfortably under a helmet without pressure points, while still delivering the warmth that makes it worth wearing on its own when the day winds down. The cuff folds up for more coverage when temperatures drop and rolls down when they ease, which keeps the beanie useful across a wider range of conditions than its weight would suggest. Soft construction and a relaxed fit mean it earns rotation on non-ski days just as easily.