The Endurance M2 has a few elements that make it perfect for long rides in the backcountry. It was developed with the 2-layer TC Technology. This means that the shell is made with two layers - a standard EPS foam core and an in-molded polycarbonate shell. The combination of the two makes it lightweight and strong. It covers a bit more of the back of the head than the M1, making it ideal for technical trails. ORBEA shapes it with 21 vents to maximize airflow for comfort in hot weather, and the front four have mesh installed to keep out the wayward bee or spider as you blaze down the trail. Like ORBEA's other helmets, the Endurance M1 features Coolmax pads for optimum cushioning and comfort. You’ll also get a removable visor and an easy-to-use ratcheting dial retention system in the back.