Thicker tread has deeper cleats with sharper edges for more traction. Interior key points are textured to allow overshoes to easily slip on and off. No-pinch molded in button and two button holes for better fit and protection. Heavy duty heel kick-off for easy off. Ideal for food processing, construction, general industry, transportation, and hazardous waste clean up. Made of Frigiflex PVC compound that is highly stretchable and stays flexible in cold temperatures. Imported. Proposition 65 WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.