Gymboss SKIN Silicone Skin - Thin, yet protective This skin is not to make your timer pretty, but for the functional and practical purpose of protecting your timer from sweat or rain. Increase Water Resistance and Shock Protection in case you drop your timer or get it wet with sweat. Fits both the current model Gymboss and the miniMAX model only. Does not fit the old model timers. Please be sure you have a compatible timer before buying. Please note the skin does not make the timer waterproof, but more water resistant. You cannot submerge your timer underwater, even with the skin on.