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 PU 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 550-fill DriDown(TM)insulation is warm, packable and easy to maintain 50% recycled nylon ripstop shell with PFC Free DWR Silicone bottom sole grip for added traction Tricot lining Cinch cord cuff to seal in warmth Durable oxford sidewall Materials Shell: 50% recycled nylon ripstop shell with PFC Free DWR Fill: DriDown Liner: 100% Polyester Tricot Tech Specs - Size MD Weight: 9.5 oz / 269 g Fill Weight: 2.1 oz / 60 g