Under Armour Men's UA Run Storm Tights 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 Durable Water Repellency - Resistant treatments that allow water to simply drip off the outside and bead away Fabric - Polyester/Elastane