100% aircraft composite helmetsitting at the top of their downhill lid line, the 100% aircraft composite helmet gives you uncompromised levels of protection and yet achieves an outstanding level of ventilation and lack of weight strong. Lightweight. Safe. Strong and yet lightweight. Yes, that sums up the aircraft composite helmet nicely. Dig deeper and you'll also find it has all the safety and performance features you need to push your mountain biking to new levels. In order to achieve outstanding protection but without weighing you down, 100% use a fibreglass composite shell. Carefully engineered wall thickness achieves superb impact absorption while minimising weight. The fibreglass composite also benefits you in terms of value, keeping the cost to a less eye watering level. This is while having a very small weight penalty compared to the far more expensive carbon shell lids. A winner. 100% have also endeavoured to ensure your aircraft helmet is compatible with most neck braces and it also accepts inflatable emergency release systems. If you're pushing your mountain bike riding boundaries then you've got the best protection options available. And breathe...whether it's tight and technical trails or fast and flowing singletrack, the active cooling system, featuring 25 ventilation posts, lets your skin breathe ensuring you don't overheat and get overwhelmed with sweat. And with more airflow, there's less eyewear fogging too. More clarity. More speed. Faster lines. Comfort is in the details. 100% have got all the small details dialled too. Emergency release cheek pads make it easy to get your lid off should there be a vital need to. The ever reliable steel d ring buckle keeps your aircraft firmly in place. And the adjustable visor lets you set the angle how you like it and makes space for goggles when you're not hauling it at speed downhill. Meeting all relevant safety standards, the aircraft composite helmet will inspire you to enjoy your mountain biking to the fullest. Featureslightweight design featuring a fibreglass composite shell.active cooling system maximizes airflow more than any other helmet with a staggering 25 ventilation portscomfort liner washable, antibacterial liner, cheek pads and chin strap coversemergency release cheek pads for quick, safe removalintegrated compartment accepts inflatable emergency release systemscompatible with most popular neck brace systems.steel d ring buckle provides a secure fit while limiting weight.perfect fit engineered with 2 shell sizes and 3 eps sizes.adjustable visor with machined lightweight aluminium screws.liner sizes s 12mm, m 14mm, l 14mm, xl 14mmthe aircraft complies with astm, cpsc, ce and as nz bicycle standards.buy 100% protection from chain reaction cycles, the world's largest online bike store.