SunDaddy Women's Natural Rubber Rainboot and GardenBoot with Adjustable Calf Width and Removable Insole, Rubber Imported manmade sole Shaft measures approximately 13 from arch Platform measures approximately .50" Calf opening circumference is adjustable between 13 and 18 inches, thanks to the buckle and the gusset at calf top. Shaft measures approximately 13 inches, heel measures approximately 1 inch. Deep ridges, micro tracks and micro bumps on treaded outsole provides better traction than most rainboots in the market. Removable insole. Non-marking outsole.