The Samshield Winter Liner is created from the base of the classic Samshield Shadowmatt Helmets classic liner; with added synthetic fur and a Windstopper flap for close comfort and warmth in the cold winter months. The winter liner is adaptable for use in both the Premuim and the Shadowmatt helmet models. ASTM version sizing: SMALL 6 3/8; 6 _; 6 5/8; 6 _ MEDIUM 6 7/8; 7; 7 1/8 LARGE 7 _; 7 3/8; 7 _; 7 5/8