100% Polyester Pull-On closure Machine Wash Description Start low, go high. The ideal layer for just about any workout, the Nike Dri-FIT Swoosh Medium Support Padded Sports Bra takes the classic design to the next level, with fabric made from at least 75% recycled polyester fibres. It also helps keep you cool with X strap on the back. For every rep, step and jump—know that you're supported.