Joules Women's Wellibob Rain Boot Rubber Imported Rubber sole Shaft measures approximately 4" from arch Heel measures approximately 1" Platform measures approximately 0.5 inches Boot opening measures approximately 10" around Hardwearing natural rubber Removable insoles Water dispersing grip tread Textile lining A white wax film may appear on the surface of the boots but can be wiped off with a damp cloth. This "blooming" effect is not a defect and is caused when the boots are exposed to extreme temperatures and the wax helps prevent the rubber from weathering.