Guess what, we're an Authorized Kali Dealer! How cool is that!? Composite Fusion technology and LDL to dissipate any impacts as quickly and efficiently as possible. Micro-Fit Closure System and 2-Position Height Adjustment. WEIGHT: 300 g / 10.5 oz The Kali Protectives Alchemy Trail Bike helmet has been designed with the trail rider in mind. The Alchemy is ready for whatever your trail looks like. From crazy long, knee-busting climbs, to ripping fast descents, the Alchemy will energize you to keep pushing, keep exploring and keep pedaling. Consumer Reports called the Alchemy a "Top Fit for Mountain Bikers" and scored it 84 out of 85 in their independent testing. Kali Protectives came from a breakthrough in safety technology - Composite Fusion, a process that bonds the helmet shell and foam enabling us to use a thinner shell, creating a lighter stronger helmet. Lighter and stronger means a safe helmet with less mass attached to your head.