You are buying one WOMEN'S LADDER BACK PADDED BRAS. These were sold by Ltd. Commodities catalog company. They feature a ladder style back strap system and slightly padded cups. They are a nylon & spandex blend so they are machine care and will fit more like a sports bra. The sizes are small = small/medium, large = Large - extra large and 2XL. If you have any questions e mail me.