Sorel Men's Caribou Waterproof Boots: UPPER: Waterproof nubuck upper. Seam-sealed waterproof construction. Laces are not waterproof. INSULATION: Synthetic insulation. Removable 9 mm washable recycled felt inner boot with Sherpa pile snow cuff. MIDSOLE: 2.5 mm bonded felt frost plug. OUTSOLE: Handcrafted waterproof vulcanized rubber shell with Sorel aero-trac non loading outsole. HEEL HEIGHT: 1 in. PLATFORM HEIGHT: 1/2 in. SHAFT HEIGHT: 10 in. LACE LENGTH: ~50 in. Note: Laces and zippers incorporated in SOREL footwear are not waterproof. Uses: Heavy Snow Rated: Temperature Rated -40º F These boots will keep your feet toasty warm. They have not been worn outside and then tread is brand new. There is a B that was written on the tabs on the back as you can see in the fourth picture and there is a slight scuff as seen in the last picture.