This vest is designed to be worn with or without a wetsuit over it. In temperate waters, it can be used as an outer layer, protecting you from the cold and the sun without any restriction thanks to its sleeveless cut. In colder temperatures, it is an ideal piece to wear underneath your wetsuit while surfing or swimming in open water. This garment's pattern was specifically designed for women and conforms to a female body shape for greater performance and comfort. MATERIALS This vest is made with 2 mm thick neoprene and an SCS coating.