Details: Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior.4-way stretch construction moves better in every direction.Material wicks sweat & dries really fast .Smooth, chafe-free flatlock seam construction.Under Armour’s mission is to make all athletes better through passion, design and the relentless pursuit of innovation. HOW TO MEASURE CHEST: Place the tape measure under your arms at the fullest part of your chest, wrap around your body until your fingers meet and mark the measurement. WAIST: Measure around your natural waistline. Be careful not to squeeze too tight to allow give. TALL Sizes: All tall sizes are 2 Inches longer than regular sizes. Sleeve lengths are adjusted proportionately depending on silhouette.