Using a cloth measuring tape or a piece of string, carefully measure the distance around your head. For greatest accuracy, the measurement should be taken by someone other than yourself and the tape measure should be held snugly around head approximately 1" above the eyebrow, just above the ears and at the point on the back of your head that will give you the largest measurement. Find your measurement within the list below and reference the appropriate size for a perfect fit. * Important: If your head size falls between two of the head size ranges listed, order the smaller helmet size so the helmet you buy will fit snugly on your head. * Please Note: Sizing measurements are provided by helmet manufacturers for sizing guidelines and do not take into account head shapes which can effect overall fit and comfort. Sizes listed are for DOT or Novetly motorcycle helmets.