100% polyester Dry flat Scarf combo uses seirus innovation and Polartec "neofleece" combo technology neofleece is a proprietary design created to be the warmest insulator on earth Neofleece uses a five defense layer to keep you warm: rigid outer shell, waterproof / breathable dryhand liner, neofleece (neoprene with fleece), Thermolite, synthetic down insulation and breathable fleece Neofleece Mask and 200wt Polartec Neck Up are a mask for the warm face and neck in one product. comes with adjustable velcro closure to ensure a snug, comfortable fit​​