This is the Aqualung 5mm Manta Boot Scuba Diving Molded Sole Boots Booties Features: 2-color compression molded sole, built-in arch support & raised heel for comfort Neoprene innersole is 2mm thicker than upper for added comfort & warmth Non-corrosive Delrin #10 heavy-duty zipper with zipper lock Ranging from warm to cold water conditions, Aqua Lung offers a wide array of boots for your diving adventure. With ergonomic soles, that add to your comfort and keep your feet warmer, soft to hard sole and quality materials and components, the Aqua Lung line of boots is a complete offering with innovative features only found in Aqua Lung boots.