Details, Size & Fit. The Calvin Klein CK One Micro Push-Up Brafeatures supportive underwire and moulded cups. Adjust The convertible straps and hook and eye back fastenings for your perfect fit. Stretch microfibre fabric Moulded plunge cups Supportive underwire Double, convertible straps Hook and eye back closure. Machine wash cold. fabric / material: NA.SKU: CA221AC71SYQ.