Giro Helmet User Manual

Giro helmets come in lots of sizes, so chances are there’s one that’s going to 
fit you. If the helmet you now own doesn’t fit on your head leaving little 
room between your head and the padded liner, exchange it for one that does.

If you bought a Sonic

™

 model, notice that there is a second set of pads 

included. You can customize the fit with these adhesive backed sizing pads 
to get a snug fit. 

The front of your helmet should fall just above your eyebrows. If the front 
is too low, you won’t be able to see hazards like cliff edges and young 
freestyle prodigies. If the front is too high, you’ll look like a geek and your 
helmet will not provide as much protection as when positioned properly 
(Figure 1). Try strapping your goggles on. If the helmet is on correctly you 
won’t be able to scratch your forehead. 
 
 

 

 
You’ve no doubt noticed the straps hanging off your helmet. As plush as 
they are, they’re not there just to warm your cheeks. They are designed to 
keep your helmet on by buckling under your lower jaw. If your straps aren’t 
adjusted right, your helmet won’t stay on properly. So pay attention. 

To adjust them, fasten the buckle and tighten the chin strap by pulling on 
the loose end of the strap until your helmet fits snugly. How snugly? As 
snugly as you can without impairing your ability to chew and swallow an 
energy bar. Got it? Now make sure the loose end of the strap still loops 
back up through the rubber “O” ring.

If you have a Nine.9

™

, S4

™

, SST, or Sonic you’ll also want to position the 

strap guides so that they rest just below your ear lobes (Figure 2). To do 
this on the Nine.9, open the Tri Loc

™

 (Figure 3) and adjust the front and 

rear straps to move the Tri Loc up or down, fore or aft. Snap the Tri Loc