The Guard Cross Back Workout Bikini utilizes a thin strap design, for minimal strap constriction and maximized support. Engineered for lifeguards, 100% chlorine proof. The Lifeguard Workout Bikini never fades, providing 100% colorfastness and maximum sun resistance for performance outdoors. Perfect for the pool or beach. Safety first, but style and performance matters. The top runs a bit smaller than the bottom. This is recommended for those with a smaller chest size. If you receive this product and the top or bottom doesn't fit, you can exchange for a larger or smaller size.