Sierra Designs Down Slip-On Navy Medium. The Sierra Designs Down Slip-Ons are easy-on easy-off slippers stuffed with 550-fill DriDown insulation for the coziest adventures away from home. Non-slip PU soles and oxford sidewalls provide traction and durability when relaxing turns to roaming and the long-lasting foam midsole provides lightweight support under foot. Plus with PFC-free Durable Water Repellent (DWR) coating and an elastic cuff to keep moisture and drafts out you can finally give the cold shoulder to cold feet. Specifications for Sierra Designs Down Slip-On: Manufacturer: Sierra Designs Gender: Unisex Age Group: Adults Boot Style: Slip-On Shoe Fastener/Closure Type: 50percent Recycled Nylon/50percent Nylon Ripstop with DWR finish Activity: Casual Outdoor Seasonal/Temperature Use: All Seasons Insole Material: Polyurethane Insulation: DriDown Finish: DWR Features of Sierra Designs Down Slip-On Rear pull-on loop Elasticated entry with stretch inserts for a snug fit Durable oxford sidewall Durable oxford sidewall PE foam midsole for lightweight cushioning Collapsible heels can be worn up or tucked away for use as slippers Package Contents: Sierra Designs Down Slip-On Sierra Designs 44940523NV-MD: Down Slip-On Navy Medium