Under Armour EVO ColdGear Compession Running Shorts Ergonomic Waistband - Ergonomic waistband delivers greater back coverage for added warmth and protection 4-way Stretch Construction - Improves mobility and accelerates dry time Dual-Layer ColdGear - Gives you an ultra-warm, brushed interior and a slick, fast-drying exterior Fabric - Polyester/Elastane