Sperry Duck Boots Size 7 Stay warm and dry all day in the women's Sperry Saltwater Duck Boot. This Sperry Saltwater Boot for women sports a micro-fleeced lining that provides the ultimate comfort and warmth in cold and wet weather conditions. This Sperry rain boot is constructed with a non-marking rubber lugged outsole for traction protection and slip-resistance, easy on and off with zipper closure Fabric lining, Removable cushioned footbed