Choosing between S/M/L/XL will get you a better, safer fit.

Once youve done that, tighten your chin strap so it is snug but not choking you.

Two fingers width between your chin and strap is typically the rule of thumb.

Of course, make sureyoure wearing the thing the right waytoo.

The Best Bike Helmet for Commuters| The Sweethome

Photo byNew York City Department.