Mountain Hardwear Men's Airshield MCZ Half Balaclava Windproof and breathable AirShield microfleece has an exceptional warmth-to-weight ratioPanel, Technostretch (93% polyester, 7% elastane) Snug fit for use under a hood or helmetAvg. weight, 1.7oz / 47g Technostretch in key areas for venting/comfort Full neck coverage Body, AirShield Fleece (100% polyester)