Oakley DRT5 MIPS Mountain Bike Helmet Tear up the trails assured of the highest levels of performance and protection in the Oakley DRT5 MIPS Mountain Bike Helmet. This versatile helmet includes top MIPS brain protection, an additional layer designed to reduce rotational forces and the potential resulting brain injury in the event of a crash. The helmet is secured using a BOA FS1-1 system with height adjustability. TX1 lace retention helps to reduce the build-up of pressure around the temples and is designed for high compatibility with eyewear. The visor itself also offers goggle stowage in a forward-facing position. When you're not wearing your glasses, they can be safely stowed in the Eyewear Landing Zone. Small hooks in the rear vents can be opened or closed to either allow for easy on/off, or to lock your glasses in for a more secure hold. X-Static wicking pads soak up perspiration and a washable silicone guard prevents sweat from running into your eyes or streaking your eyewear.