From the gym to the park, the VS Knockout sport bra offers total wireless comfort thanks to a zip-front racerback Design. Breathable stretch fabric keeps you cool, move after move, rep after Rep. Get a runway body in performance workout gear from Victoria’s Secret Sport. Medium Support. Spacer pad technology for lightness and Breathability. Easy zip-front Closure. Nylon performance fabric with 4-way Stretch. Body-Wick keeps you cool & Dry. Machine Wash. Tumble Dry. Imported. Arm candy and black/gold sparkle are nylon/Spandex. Heather grey/black is polyester/nylon/Spandex.