Lightweight and strong Carbon Fiber, Kevlar and fiberglass MIT (Multiple Inclusion Technology) shell construction. Enough said where else can you get this quality of a helmet for under $200 dollars. This helmet runs true to size. Fit and finish are way better than any poly helmet for the same price. Don't get me wrong this is not an Arai or Shoei Helmet at 500-600 dollars but the M2R is a great quality helmet for a great price.