The Tacx Sweat Cover for Smartphone is an ingenious holster that carries your smartphone in an easy-viewing fashion while we're spinning on our trainer, riding around town, or even on the trail. To ensure your bike and smartphone remain funk-free, the cover's absorbent textile soaks up sweat pouring from your face and body. It's compatible with virtually any bike on the market, thanks to its stretchy attachment band that loops around your seat tube and fastens to both sides of the handlebars. The clear smartphone carrier gives you a transparent window to your smartphone screen, so you can view training stats in real-time, such as current power output and mileage.