These cotton-rich, ribbed racerback vests feature our built-in Secret Support™, so you don't have to worry about your bra straps showing. Non-padded and non-wired for a natural silhouette. Ribbed fabric with added stretch for comfort and flexibility. All of the cotton for our clothing is responsibly sourced and always will be. M&S Collection: versatile styles in modern shapes with unique and playful details.