SWEAT-WICKING SUPPORT FOR MEDIUM-IMPACT ACTIVITIES. The non-padded Nike Sports Bra combines compressive fabric with sweat-wicking technology to help keep you dry and comfortable during medium-impact activities. A racerback design lets you move naturally when you're getting after it. Keep dry: Dri-FIT technology pulls sweat away from your skin to help you stay dry and comfortable. Move freely: racerback design lets you move naturally through your workout. Flat seams feel smooth against your skin. Feel supported: compression design offers a supported feel during medium-impact sports like gym workouts, spin, cross training, tennis and running.