Due to the nature of triathlons as a race consisting of multiple sports many pieces of technical equipment have been borrowed from other sports, or developed specifically in an effort to race faster and improve a competitors safety. Trisuits A trisuit is a single skin tight item of clothing designed specifically for triathlon athletes to provide comfort and remove the necessity to change clothing while switching from swimming to cycling to running. Normally a trisuit is a single item of clothing; however, two-piece versions exist with separate shorts and top. These are mainly chosen for longer races where comfort is more important. All trisuits have a cycling chamois built in for comfort on the bike leg of the competition. However, these are thinner than traditional shorts for cycling to allow the wearer to run without additional friction. Traditionally, trisuits have no sleeves to allow for greater shoulder mobility for swimming, but trisuits with tight-fitting sleeves have become more popular recently. The material of a trisuit is important, as athletes will go from swimming to cycling, the clothing needs to be quick-drying so as to be comfortable for the majority of the cycling. The material also needs to be wicking or breathable, as cycling and running are sweat-producing activities and the trisuit is tight-fitting. Watch & Heart rate In modern competition, triathletes often wear a watch to monitor time. This watch may be a smartwatch, tracking other metrics like distance, pace, and speed. A triathlete may also utilize a heart rate monitor, either on the wrist or across the chest, to help maintain a sustainable pace with maximum energy efficiency without "bonking" or "hitting the wall" (becoming too fatigued to continue). Swimming equipment Typical equipment for the swim segment include a swim cap, goggles and possibly a wetsuit. Cap and Goggles Swim caps are normally provided by the event with the colours to organise and categorise swimmers by event or by heat. Swim goggles are used to protect the eyes of the swimmer from the water and to allow greater vision when swimming. In some triathlons the swim portion is held in a swimming pool if this is the case no wetsuit is used and no special care is required for the goggles or swim cap. Usually though triathlon swims are done in open water (lakes, rivers, or oceans), therefore extra considerations must be made about equipment. Due to the reduced