!!! Note: As we also sell this helmet in our store, it is best to inquire about availability before purchasing !!! Tri-Composite consists of fiberglass, aramid fibers ( kevlar ) and carbon With forehead and chin ventilation (chin ventilation adjustable from the inside) Measure around the widest part of your head (above your ears) to find the right size If you don't have a tape measure handy, take some thread or tape and measure the distance against a ruler Once you have the helmet on and secure it, shake your head vigorously to see if the helmet slips. If he does, he's too big Test whether you can get under the helmet with 2 fingers. If so, the helmet is too big Wear the helmet a little before your first ride. If you get a headache, the helmet is probably too small Gimbel Auto and Motorcyc