Ripcurl Cali Watch, 316L stainless steel case, Leather strap construction, Depth tested to 100 m, A gorgeous watch from Ripcurl with all the quality and style you would expect. The casing is made from 316L stainless steel, which is the highest grade for waterproofing, strength and non-corrosion in a marine environment. The thin leather strap looks delicate and feminine, but is high quality and designed to be comfortable and long-lasting.