SWIMRUN CORE TOP The 2 piece Swimrun Core is a suit specifically designed for warmer Swimrun competitions. Adapts to the needs of both running and swimming competitions. Its two-piece design, fastened together by Velcro, 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. Large, accessible front pockets!