Bali Concealers UW Minimizer Cups: 76% Nylon, 24% Spandex. Cup linings: 100% Polyester. Cup pads: 100% Polyurethane Foam. Center belt lining, Inner strap: 100% Nylon. Center belt: 86% Nylon, 14% Spandex. Backs, Straps: 75% Nylon, 25% Spandex. Exclusive of trim and elastics. Hand wash bras closure Minimizes up to 1 Concealing Petals in the inside of cup help prevent show through Wide array of body tones Smooth design helps bra disappear under clothes 3 column, 2 row hook and eye rear closure