A swimskin, is also referred to as a speedsuit, is a technical swimming suit designed to be worn over your normal triathlon race kit for swimming. They are sleeveless and most end above the knee. Unlike a wetsuit, a swimskin will not provide buoyancy or warmth and as such do not enhance speed to the same degree. However, swimskins may be worn for swims when water temperatures are too warm for wetsuits, which for Ironman is 24.5 °C. Not all swimskins are permitted in Ironman events. Swimskins permissible in Ironman events must be made of fabric, as opposed to neoprene or rubber. They also may not go below your knee.