Abstract: A diving wet suit comprises an inner shell having a body formed of a non-stretch material that is a flexible plastic sheet reinforced with a fabric and including a complete waterproof stretch material for a neck and both wrists and shoes for both feet and a waterproof fastener extending from the back to both arms of the body and an outer shell formed of a resin coated cloth and including pads in leg and hip portions and an opening extending from the back to both arms. The inner and outer shells are provided with holes for mounting valves in the breasts and shoulders so as to fixedly hold them between the valves. Included also are one area fastener provided in the vicinity of the waterproof fastener attached to the inner shell from the back to both arms and the other area fastener provided on the outer shell to join the inner and outer shells together.