First Racerback Style: 95%Cotton and 5%Spandex; Second Cross Style: 60% Cotton, 20% Modal, 20% Spandex; Wire-free. No clasps or hooks to mess with. It stays feeling great all day and all night long! Its simple crossover front design, easy one-handed drop-down cups Provide Quick Feeding. Fashion sexy racerback design, prevent shoulder straps from slipping off. Sleep bra has built-in bag, you can insert the breast pads. Bust elastic free band doesn??t constrict or pinch, Move comfortably day or night. Can be used while you are pregnant as well as after as a nursing bra. After weaning can be used as a simple sleep bra.