100% Polyester. Armour Fleece® is light, breathable & stretchy for warmth that still lets you move. Soft inner layer traps heat to keep you warm & comfortable. Stand Collar. Generous 1/2 zip front makes for easy layering. Bungee drawcord at waist. UA logo at left sleeve Men's Under Armour Carbon Heather Armour Fleece Half-Zip