89% POLYESTER. 11% ELASTINE. PERFECT FOR CRISP MORNINGS. SMOOTH AND LIGHTWEIGHT YET PROVIDES JUST ENOUGH WARMTH. BACK VENT ALLOWS FOR AIR FLOW AS YOU BEGIN TO WARM. FABRIC IS STRETCHY, SO YOU CAN SWING FREE AND EASY. SWEAT-WICKING FABRIC HELPS YOU STAY DRY WITH EVERY SHOT. NIKE SWOOSH ABOVE LEFT CUFF.