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 * ColdGear - Gives you an ultra-warm, brushed interior and a slick, fast-drying exterior.