- 450-fill-power duck down insulation (60/40 down/feather fill) compresses easily for packing - Polyester shells feature a durable water repellent finish to fend off moisture and light rain - Deliciously soft polyester fleece linings are heaven on bare feet - Elasticized instep straps keep booties secure - EVA midsoles help provide cushioning underfoot - Polyester soles sport polyurethane beads for enhanced traction X Large fits women's shoe sizes 10 - 11 *Box is slightly ripped but booties are new, never been worn.