From Thirdlove's website: All the "wow!" without a wire. The first bra made with Precise Sizing™ to give you superior fit, lift and support (including you, small bands with large cups.) No poking or uniboob, yes comfort and shape. Better cup-band fit via Precise Sizing™ Lift & support from built-in foam cups Soft, seamless 360° stretch knit Adjustable straps & back closure True to size Nylon/spandex; polyester Precise Sizing™ uses the idea of lettered sizing with scaled cup sizes for a better, more comfortable fit. Specially designed to alleviate issues small bands with large cups experience. XS—3X: best for up to C 1/2 cups XS+—XL+: best for D–E1/2 cups XS++—XL++: best for F–G cups Please note: NWT size XL+ (would probably fit a 36D or 38D best)