With a silhouette all it's own, the Sonya onesie is the perfect mix of flattering fit and comfortable coverage. Sonya has a 1/2" higher leg opening than our other one-pieces and is also 2" higher at the center back. It's designed with slim coverage across the bum for a contemporary look, but with a higher rise so you feel covered where you need it. JOLYN does not recommend tie straps to be used in racing or FINA sanctioned events.