Playtex Secrets Forever Lace Underwire Style # 4233 Cups Back Center Cup Extension: 89% nylon 11% spandex. Cup Extension Lining Center Lining: 100% nylon. Back Cup Lining: 85% nylon 15% spandex. Exclusive of other trim and elastics. Cups, back, center, cup extension: 89% nylon, 11% spandex. Cup extension lining, center lining: 100% nylon. Back cup lining: 85% nylon, 15% spandex. Exclusive of other trim elastics. Underwire cups have no padding, cookies or lining. Cups have inner sling side support. Straps are rigid in the front and 1/2" adjustable elastic in the back. Back closure bra with 3 row, 3 column hook and eye adjustment.