Our injection molded Workbrutes PVC overshoe has 46 percent more material in its outsole than the nearest slush molded competitor. Our Frigiflex PVC compound contains special additives for high stretch and flexibility in cold temperatures. Injection molded, seamless construction for 100% waterproof protection. Injection molding puts less material in the upper eliminating unnecessary weight, for reduced leg fatigue. For longer life more material is added to the sole at the greatest wear points: the heel, toe, and cleats. Thicker tread has deeper cleats with sharper edges for more traction. Key interior entry points are specially textured to allow overshoes to easily slip on and off over rubber sole shoes. Boots feature no-pinch molded in button and two button holes for better fit and protection. Heavy duty heel kick-off for easy off.