Nike Workout Sliders are versatile training discs that work well on both hard and carpeted surfaces. The plastic side works best on carpets, while the foam side works best on hard floors. They are not intended for use on rubber mats. Key Features: For use on hard and carpeted surfaces. Plastic side for carpets, foam side for floors. Not suitable for rubber surfaces. Technical Specifications: Material composition: 85.43% polypropylene, 11.04% ethylene vinyl acetate (EVA), 3.53% elastane.