Meet Your Foot's New BFF The Sierra Designs Down Booties are nine ounces of DriDown(TM) goodness wrapped around your feet. Made with a tricot liner and durable recycled polyester taffeta that cinches at the cuff to seal out drafts, these booties are like bringing your favorite house slippers to the hut, the campsite or on errands around town. And with a non-slip silicone sole, PFC-free Durable Water Repellent (DWR) coating and a foam midsole to support your weight, they're sturdy and substantial for impromptu wanderings, inside or out. Features 800 Fill DriDown(TM) 100% Recycled Polyester Taffeta Silicone bottom sole grip for added traction Tricot lining Cinch cord cuff to seal in warmth Durable oxford sidewall PE foam midsole for lightweight cushioning C0 PFC-Free DWR Materials Shell: 100% Recycled Polyester Taffeta with PFC-Free C0 DWR Fill: DriDown Liner: 100% Polyester Tricot Tech Specs - Size S/M Weight: 9.5 oz / 269 g | Sierra Designs Down Booties in Black, Size Medium