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