LS2 Helmets Rebellion Solid Helmet The LS2 Rebellion is a motorcycle half helmet that stands alone and charts its own course, just like you. We set out to revolutionize the half helmet market. We started with a stylish shell made of our high performance, lightweight Kinetic Polymer Alloy (KPA). It has just the right blend of retro-cool with a technical edge. Imagine a half-shell motorcycle helmet that offers flow-through, ported ventilation to keep you cool on the hottest of days. The short peak and Twin Shield System drop down sunscreen will protect your eyes when the sun is in the horizon. The sun shield itself has a unique, two-stage adjustability: lock it 129.98