How to wear a bicycle helmet: The helmet should be worn horizontally, and should not be tilted forward or backward. Some riders think that the brim in front of the helmet is a bit blocking the line of sight, so they raise the helmet a lot to get a good view. Effect. Wearing steps: Most helmets these days come with quick resizing straps 1: Open the drawstring. 2: Place the helmet horizontally on your head and slowly tighten the straps until you feel comfortable. 3: Adjust the strap to be placed under the ear. 4: After the straps are adjusted, tighten the straps against the chin. When you have done the above, make sure that the helmet does not move more than 1 inch (1 inch = 2.5400 cm) and that the helmet does not fall off until the straps are released. Tips: To wear the helmet correctly, the thickness of the helmet adjustment strap should be about 1.5 cm below the ear. The entire strap is fixed on the chin, not the throat, and also leaves a finger thickness, about 1.5 cm.SIKW H-203 HELMET  NAME:HELMET MODEL:H-203 TYPE:CYCLING HELMET PROCESS:IN-MOLD MATERIAL:EPS+ABS VENTS:14 HOLES WEIGHT:ABOUT 351G SIZE:M(54-58CM)/L(58-63CM)