Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior; Stretch-mesh back & underarm panels provide strategic ventilation without sacrificing warmth; 4-way stretch material moves better in every direction; Material wicks sweat & dries really fast; Ergonomic design keeps seams off of high abrasion areas; Dropped, shaped hem; 87% Polyester/13% Elastane