Using the Rally WaveCel Mountain Bike Helmet is a breeze. First, put it on your head and use the BOA Fit System to adjust the fit until it's just right. The lay - flat camlock straps and Fidlock magnetic buckle make it easy to secure the helmet. If you're wearing goggles, use the three - position visor to get the best view. You can also store your sunglasses in the built - in storage. For extra functionality, attach a Trek light or GoPro using the removable Blendr mount. When it comes to maintenance, clean the helmet regularly with a mild soap and water. Avoid using harsh chemicals as they might damage the helmet. Also, check the helmet for any signs of damage before each use. If you notice any cracks or significant wear, it's time to replace the helmet for your safety.