Sooruz Divine Womens Back-Zip (5/4)Sooruz' most multipurpose women's wetsuit made using Oysterprene Y5, an eco responsible evolution that improves flexibility without increasing pricing. The 5 4mm option here is best suited for use in the Autumn Winter time. Features: Oysterprene: foam made from oyster shell powder The seams are sewn and glued (GBS) and reinforced with patches at intersections and critical areas Thermo Loop: New inner polar lining on the upper thighs belly and back for