Lightweight bra offers full back coverage, extra-wide straps and stretchy, breathable construction for comfortable support as you sleep or go about daily activities. 95% cotton/5% spandex; machine wash. Order by bust size: Small (32"-35"), Medium (36"-39"), Large (40"-43"), XL (44"-47"), 2XL (48"-51"), 3XL (52"-55") or 4XL (56"-59"; cotton only).