Under Armour's famous ColdGear base layers are designed to keep you warm, dry, and light. This fitted crew-neck shirt is made from quick-drying, 4-way stretch, 7.25-oz. 96% polyester, 4% elastane. The warmest UA base layers available, heavy-weight Base 4.0 garments offer ultra-warmth for "brutally" cold conditions. ArmourBlock anti-odor technology helps reduce unpleasant body odor. Ergonomically placed flatlock stitched seams and raglan constructed shoulders offer ultimate mobility and comfort next to your skin. Features thumbholes. Cuffs and neck are constructed from 4.5-oz. 93% polyester, 7% elastane. Fitted. Imported.