Nancy Swim Onesie - BlackThe Nancy Onesie is built for movement, coverage, and a barely there feel where it counts. It features wide straps and fuller coverage at the front and back leg openings for a secure, confident fit. The back opening stays open and airy for freedom of movement, while the shape offers higher bum coverage than our other open back stylesgiving you that open back look you love with just a little more security. Features: Good for: Swimming, water polo,