This top is 95% Nylon and % Spandex for extra stretchThe tag says One-Size-Fits-All but the measurements make the tank roughly a size Small or Medium - the top has enough stretch to work with both sizes. Return PolicyCustomer satisfaction is very important to us; therefore if you are not 100% happy with your item, you may receive a REFUND for this item. Item must be returned within 30 days of delivery date. The item must be in the original condition in which it was received with all tags attached and bags included; free of perfume, body odor, dry cleaning chemicals, or cigarette smoke. Buyer is responsible for return shipping charges.Please contact us if an item was sent in error on our part so that we can resolve any issues immediately. We would like to make sure that you are 100% happy with our products and customer service. Additional InformationWe are here to make this an excellent purchasing experience for you and appreciate it if you can leave us a positive feedback. We will post a positive feedback in response once a positive feedback is left by the buyer. We reserve the right to cancel any transaction due to an unconfirmed address, special requests that we cannot comply with, unavailability of product, etc. If a transaction needs to be canceled and you have made a payment, you will receive a FULL REFUND as soon as possible and a transaction cancellation form will be sent to end the sale. Due to different computer settings and resolutions, some colors may vary in person from what is displayed on the screen.