Kirkland Signature Men's 1/4 Zip Polartec&reg; Fleece Brown Heather (Medium) 100% Polyester - Quick drying Breathable. Lightweight, Durable, Quick Drying, Polartec Micro Fabri Flat seams for additional comfort  zip for extra ventilation Open cuffs and hem Lightweight and durable Machine washable Polartec Classic Micro fabric for warmth without weight