Tingley 31151 Pilot Black Waterproof PVC Plain Toe Mud & Dirt Boots, Size 7-13 When you are working in wet, muddy conditions, Tingley's General Purpose PVC knee boots provide easy walking and all day protection.Injection molded construction for 100% waterproof protectionFlexible upper material stays supple in cold temperatures to make walking easier.Tougher outsole material for good abrasion resistanceSelf cleaning cleated outsole, spits out debris as you walkRemovable cushion insole wicks perspiration to help keep feet dry and comfortableFlexible upper material stays supple in cold temperatures to make walking easier