Outdoor Research Tundra Aerogel GORE-TEX® INFINIUM Balaclava NASA-approved insulation, winter-ready balaclava design for high altitude mountaineering The Tundra Aerogel Balaclava celebrates the insulation trusted and tested by NASA with PrimaLoft® 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. Final Sale: Sorry, we do not accept returns or exchanges on masks, neck gaiters, or face coverings. 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 Design Features Laser cut breathing vents Flat-Seam Construction Outdoor Research Tundra Aerogel GORE-TEX® INFINIUM Balaclava