The Oh Ewe II from Acorn naturally wicks away moisture,is hypoallergenic and biodegradable. This bootie has a lofty Acorn memory foam midsole over a comfort cushion layer of featherweight EVA. Also it has a non-slip weatherproof outsole for indoor and outdoor wear.Additional InfoMemory Foam,Sheepskin,Biodegradable,Holiday 2015,Mom's Favorites 2016