Tacx Sweat set (towel + sweat cover for smartphone)Indoor training means plenty of perspiration. This set contains everything you need to protect your bike and keep yourself comfortable while you ride. Sweat Cover for Smartphone: This convenient cover protects your bike from sweat while giving you access to your smartphone while you ride. Made from absorbent material and featuring a clear pocket for your phone, it fits most bikes and mounts easily. The pocket is suitable for different phone sizes,