Layers are a fundamental part of winter sports and the Armada Hoopler long underwear top is going to impress. The 4-way stretch nylon and wool blended fabric offers chafe-free flat seams for ultimate comfort, stretch and durability. If you're looking for the be-all, do-all base layer, the Hoopler might just be the best option, complete with UPF 50+ sun protection and thumbholes to keep those sleeves in place! 77% Nylon, 19% Wool and 4% Spandex - Offers that next-to-skin softness everyone searches for, while offering up anti-abrasion properties., 4-Way Stretch - Increases mobility and comfort for all-day wear., Chafe-Free Flat Seams - Improves feel under layers, backpack straps or out on a hike., Moisture Wicking - Great for any activity that might have you working up a sweat., UPF 50+ - From the snow to the sun, this layer protects you from the sun's harmful rays whatever activity has tied up your time., Fixed Hood - Comes with a built-in neck gaiter for those extra frigid days., Fit: Tight, Warranty: One Year, Wind Protection: No, Material: Wool/Synthetic Blend, Weight: Mid, Type: Top, Wicking Properties: Yes, Water Resistant: No, Recommended Use: Snow, Antimicrobial: Yes, Anti Odor: Yes, Quick Drying: No, Moisture Wicking: Yes, Model Year: 2022, Product ID: 908768, Model Number: R00504010 M, GTIN: 00842339177745