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What Our Gearhead(R) Experts Are Saying:"The Chill River Long-Sleeve Shirt is my top pick for keeping kids cool and protected during outdoor adventures. The cooling fabric really works to keep them comfortable, while the thumbholes make layering or extra sun coverage super easy."Columbia's Chill River Long-Sleeve Shirt is a kid-friendly essential for sunny outdoor adventures. Built with Omni-Shade UPF 50 fabric, this lightweight layer defends against harmful rays, while Omni-Freeze technology actively cools them during play. Perfect for hikes, park visits, or sports practice, the moisture-wicking Omni-Wick fabric keeps kids dry and comfortable even when they work up a sweat. Thumbholes add functionality, securing sleeves in place and offering extra coverage when needed.