Comprised of trail running and open-water swimming, swimrun, possibly the newest endurance sport, has been gaining popularity since the early 2000s. Swimming in open water is significantly more challenging than swimming in a pool, so it’s worth equipping yourself with appropriate equipment. The absolute must-have is a tight-fitting wetsuit that keeps the body warm during swimming but at the same time can be worn during the running stages. In addition to its warming properties, a wetsuit made of neoprene improves speed in the water, and the flexibility of swimrun wetsuits makes for a more comfortable run.