The Avail Baselayer is powered by Trizar® technology, which reflects your body heat back to you for incredible warmth without the weight. Paired with an ultrasoft brushed interior, this performance top is the ultimate cold-weather layer. Product Features : AriatTEK® is designed for optimal comfort in any weather, with built-in performance features that adapt to changing conditionsMoisture Movement Technology™ helps wick moisture away from the skin to keep you dry and comfortableSun Protection Fabric™ helps block harmful UV rays, keeping you covered and comfortable during long days outdoorsTrizar® Certified Space Technology® delivers advanced temperature managementhelping keep you comfortable in changing conditions, Ergonomic thumbholesClean, elevated style lines with modern collar Women's Avail 12 Zip Baselayer in Black PolyesterElastane, Size: XS by Ariat