The Tundra Aerogel Balaclava celebrates the insulation trusted and tested by NASA with PrimaLoftA(R) Aerogel: The world&';s - and as far as we know, space&';s - most reliable warmth. A polyester crown, windproof construction, and strategically placed Aerogel insulation add durable warmth where you&';re most susceptible to frostbite; along the cheeks, over the nose, and under your eyes. Over-the-mouth neoprene blocks wind while providing stretch and insulation, and venting around the mouth allows condensation to escape so your goggles won&';t fog up. Specs:- PRODUCT : #271535 FABRIC : GORE INFINIUM with WINDSTOPPER 3L 100% Polyester face and neck, Neoprene mouth piece 54% Nylon, 41% Polyester, 5% Elastane crown and back of neck 63% Nylon, 23% Polyester, 14% Elastane nose piece 1.5mm Primaloft Aerogel Insulation nose and cheek bones WEIGHT : 2.4 oz/69 g Features:- FABRIC PERFORMANCE Wicking Windproof Breathable Aerogel Insulation Across Nose and Check Bones