Stay warm and dry in cold weather with the Under Armour Long Sleeve Stretch Fitted Armour Mock. This performance baselayer features ColdGear® dual-layer fabric with a soft brushed interior for warmth and a moisture-wicking exterior to keep you dry. Strategic stretch-mesh panels provide ventilation, while the ergonomic seam design minimizes irritation. Perfect for workouts or hiking, this big and tall mock can also be worn under clothes for extra warmth. The four-way stretch fabric ensures comfort and mobility, while the fitted design offers a streamlined fit. Made of 87% polyester and 13% elastane, this mock is machine washable. Please note that this item runs small, so consider sizing up or consult our Under Armour-specific size guide for the best fit.