Crazy Mars Ultralight Stable Road/Mountain Mens/Womens Bike Helmet-Blue+White 85% high-density EPS foam structure,effectively reduce the shock pressure,streamlined tail design Light binding/No gap,play a better security role of the head. With removable, protective pad liner and sweat chin pad, comfortable to wear and easy to wash. The removable visor help to avoid foreign bodies and provide a shade for our eyes. Size: head girth: 56-62cm, head width within 18.5cm.The adjustment can make the helmet be suitable for you, over 95% people can use it. Take a tape or piece of ribbon and measure around largest circumference of head. Take a record of your data. Compare it with our helmet size to check if it fits you. <span class="a-text-bold">Brand: </span>Crazy Mars <span class="a-text-bold">Model:</span> helmet-T <span class="a-text-bold">Material: </span>PC shell + EPS foam <span class="a-text-bold">Color:</span> Black, Blue and White, Green+Balck+White, Orange and White, Red and Black, Yellow and Black <span class="a-text-bold">Size:</span> 50 -62cm <span class="a-text-bold">Length:</span> 23cm <span class="a-text-bold">Width:</span> 18.5cm <span class="a-text-bold">Weight: </span>220g <span class="a-text-bold">Target Audience:</span> Adult, Unisex <span class="a-text-bold">Intended Use:</span> Road biking helmet, cycling helmet, mountain bike helmet, skateboard helmet, skating helmet Adjust the length of the webbing. Keep one finger wide. Straighten the helmet. Check if the buckel is in good condition.