Ergodyne N-Ferno 6970 Winter Ski Mask Balaclava with Heat Exchanger Face Mask HEAT EXCHANGER Built into face mask provides warm air inhalation for extreme conditions REMOVEABLE FACE MASK Adjustable with hook & loop attachments. Form-fitting design keeps cold air out and prevents eyewear from fogging FULL COVERAGE 320 grams of thermal fleece protects head, face and neck from the cold ONE SIZE FITS MOST Strechable warm fleece comfortably fits most heads to provide the ultimate winter protection and comfort FULL COVERAGE WARMTH Long length covers face, nose, mouth, and neck while maintaining breathability