Under Armour ColdGear Short Sleeve Compression Running T-Shirt Dual-Layer ColdGear technology - Provides a durable, slick, fast-drying exterior. Flatlock Stitching - Prevents chafing Flexible Fabric - 4-Way Stretch improves mobility, maximizes comfort, and maintains shape Moisture Management - Advanced moisture management technology keeps you warm, dry, and comfortable Interior - Ultra-brushed interior is soft to the touch and traps warmth like a beast