Description of Vega Helmet - Off Road (Silver) HOW TO MEASURE YOUR HELMET SIZE 1# Use A Measuring Tape to measure the circumference around your head 2# If you donâ€TMt have a measuring tape, use a piece of string. Then place the string on the table and measure the length with a ruler. 3# Please refer to the video tutorial below, on how to measure your helmet size. 4# Once you have measured the size, choose the appropriate size and then proceed to buy. 5# Buy your helmet and have a safe and enjoyable ride! VIDEO TUTORIAL : MEASURING YOUR HELMET SIZE ? About Vega Helmets: Vega is one of the leading manufacturers, competing with the world leaders with respect to Design, Process and Product Quality. The companyâ€TMs ideology of Safety coupled with Fashion has become a pioneer in promoting Helmets as DESIGNER HEAD GEAR. Their vast range has been approved by the Bureau of Indian standards (ISI) 4151..