A two-layer fabric with an ultra-warm, brushed inside and a smooth, quick-drying outside.Stretch mesh panels in the armpits provide strategic ventilation without heat escaping.The 4-Way Stretch technology allows for better movement in every direction.The material wicks away sweat and dries very quickly.The ergonomic design prevents seams from forming in areas with a high degree of abrasion.Collared neckline for added coverage and warmth.