Practical foldaway design Compact for easy stowage Adjustable to maximize comfort Knitted outer, with warm insulting lining Heat Holders® Men's Atwood Flat-Knit Earmuffs have been created using our high performance thermal yarn and HeatWeaver® insulation lining to maximize the amount of warm air held close to your body. Featuring a clean flat-knit aesthetic, and a compact, foldable design to make storage and transport a breeze. Perfect for protecting your ears from the chills of the coldest months!