What Our Gearhead(R) Experts Are Saying:"I use the UPF 50+ Light Arm Sleeves on long summer rides where I want sun protection without overheating. They breathe surprisingly well and stay in place, even when I'm sweating hard. Easy to stash if the temps cool off too."Sun coverage without the heat-that's what we count on from the Castelli UPF 50+ Light Arm 3 Sleeves. Whether we're logging base miles in exposed terrain or spinning through long summer days, these sleeves offer breathable protection that keeps us cool and covered. Built with lightweight Solare fabric, they deliver UPF 50+ defense while wicking moisture efficiently. A touch of silicone at the upper cuff keeps them locked in place, so there's no fussing mid-ride. When the sun's relentless but the effort doesn't stop, these sleeves are a go-to piece of protection that feels like nothing-until you realize how much it's doing.