Orca Men's Apparel Size Chart The Swimrun Top is specifically designed for warmer Swimrun competitions, adapting to the needs of both running and swimming competitions. Designed to be fastened together with the Swimrun Short with easy Velcro closure, it keeps water out while swimming, and allows for easy opening or complete removal during transitions. The added plus of buoyancy in the lower trunk keeps your legs on the surface while swimming, without limiting your freedom of movement for the run. Features: - Separate top lets you select the perfectly sized bottom piece for the right fit. - Lower trunk buoyancy helps keep your legs in an optimal swimming position - Two outer mesh pockets