Men's Thermal Underwear Set Top & Bottom Fleece Lined Please see size chart on the left image for size guide 2 Pieces Thermal Set (Top & Bottom) Fleece Lined Style 1: 92% Ultra-Soft Polyester 8% Spandex; Style 2: 100% Cotton Ultra Soft, Warm and Comfortable Great to be Wear Alone at Home or Add an Extra Layer of Warmth Under Your Clothes