Under Armour Men ColdGear&reg; Thermo &frac14; Zip Fitted Shirt Blouse Dual-layer ColdGear Thermo fabric delivers a smooth, fast-drying exterior and soft interior. Bonded hex-patterned structure traps extreme heat without adding weight for unrivaled warmth. 4-way stretch fabrication allows greater mobility and maintains shape. Smooth, chafe-free flatlock seam construction. 7.5 oz. Polyester/Elastane.