Quiksilver has been at the forefront of wetsuit technology to this day. The Marathon Session 4/3 chest zip wetsuit includes Quiksilver's innovative StretchFlight neoprene. StretchFlight neoprene offers superior warmth, comfortability, and flexibility. Quiksilver cares for the environment and has made their Marathon session 4/3 wetsuit Bluesign certified. The WarmFlight technology is made from recycled PET bottles. WarmFlight Far-Infrared thermal lining transforms body heat into infrared energy to generate and maintain warmth.