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. TWO-PIECE SUITwith the Swimrun Core 2, you can choose different sizes for the top and bottom pieces, for the perfect fit no matter what your size. The Velcro seal system keeps both pieces in place at all times. Stay comfortable even in the hottest races by fully opening the top or taking it off. OUTER POCKETSConvenient outer side pocket of the bottoms lets you store a GPS or any nutrition necessities. The top includes two outer pockets made of elastic mesh, so you can carry your hand paddles or other accessories. MODULAR DESIGNThis suit can be combined with the Swimrun Arm Sleeves, for extra warmth while you swim. BUILT-IN WHISTLEThe Swimrun Core comes with a mandatory whistle for swimrun races, so it doesn’t get in your way during the competition and can easily be used in an emergency.