THE TRELLA MIPS HELMET IS BUILT USING IN-MOLDING CONSTRUCTION TO REDUCE WEIGHT WHILE ENHANCING DURABILITY TO STAND UP TO EVERYDAY USE. The ease and comfort of our acclaimed Roc Loc Sport MIPS fit system makes fitting as easy as turning a dial, and the fit system is seamlessly integrated with the Multi-Directional Impact Protection System (MIPS), which can redirect energy and provide more protection in certain impacts. When you put it all together, you get the versatility you need to ride everything from forested fire-roads to swooping singletrack trails to the city streets.