It is important to choose a helmet that will fit you perfectly. Here are a few steps to help you find the helmet of the right size. Step 1 - Use a measuring tape or string and measure around the head - above the eyebrows /ears (area usually the helmet covers). Make a note of the measurement. Step 2 - Visit our dealers store or brand outlet and ask for the preferable helmet of your size (as noted). SizeHead Circumference (Inches)Head Circumference (mm)Head Circumference (cm) XXS20.08-20.47510-52051-52 XS20.87-21.26530-54053-54 S21.65-22.05550-56055-56 M22.44-22.83570-58057-58 L23.22-23.62590-60059-60 XL24.01-24.41610-62061-62 XXL24.8063063 XXXL25.2064064 XXXXL25.5965065 Step 3 - Try the helmet on and secure it with chin straps. The helmet should touch all parts of your head. Make sure there aren't any gaps between pads and they are touching the cheeks directly. Step 4 - Move your head up/down or left/right and check if the helmet doesn't move independently or slip over your cheeks. Step 5 - Open the straps, pull the helmet up. If getting in and out of the helmet is not requiring too much effort you have found the right fit, Step 6 - Do a 10 seconds wear-check to see if the helmet is comfortable and safe to wear for a long duration. Always try a helmet before buying.