UA Siro uses a unique construction process to create a fabric that has greater stretch & recovery, ultra-soft feel & more breathable performance. Ultra-soft, mid-weight cotton-blend fleece with brushed interior for extra warmth. Signature Moisture Transport System wicks sweat so it dries faster than ordinary cotton. Lightweight stretch construction improves mobility for full range of motion. 2-piece hood with crossover detail & adjustable branded drawcord. Hidden side hand pockets. Ribbed cuffs & hem.