Features of the Mountain Hardwear Dome Perginon Pro Beanie Constructed with Gore-Tex Windstopper fleece for relief from wind and weather Re-designed low profile dome shape Snug Fit for use under a hood or helmet Gore-Tex: Offers enduring weather protection, comfort, balanced heat transfer and optimum moisture management Fabric Details Gore-Tex Windstopper fleece 94% Nylon, 6% Elastane