A t-shirt bra that won't dig or poke. Warner's this is not a bra contains the satin comfort wire system, an encased underwire covered in luxurious satin to prevent dig-in and provide all-day comfort. Full coverage cups keep you contained to prevent spillover.The bra you’re wearing may be too small or too large around the band. Your bra should always sit horizontally around your body. Use a measuring tape to find your correct size under your arms, across your back and top portion of your chest. If the number is even, this is your band size. If the number is odd, add 1 inch to that to get your true band size.