Giro 2007 Atlas II helmet

The Atlas II helmet packs all of Giro’s standard features into a larger package for those of us with big heads. It has a snap-on visor, 18 big vents and an easy adjust fit system. It is nicely sculpted so even though it is big it doesn’t leave you looking like a mushroom head.

The Atlas II uses Giro’s Acu Dial system, which makes adjusting the helmet’s fit around your head an easy, one hand operation. The chin strap is held in place with cam-lock levers, which pop open for easy adjustment, then snap back closed and don’t slip. The visor on the Atlas II provides shade and can be removed if you don’t want it.

All Giro helmets are CPSC certified, which means they pass the industry standard tests for safety. Giro uses “In-Mold” Microshell construction for almost all their helmets, a process that permanently bonds the EPS foam layer to the hard outer shell. This makes Bell helmets much stronger and more durable than other helmets where the outer shell and EPS are just taped together.

The Atlas II is one of Giro’s “Universal Fit” helmets, in this case “Universal Large”. This means it adjusts to fit a wide range of heads, from 22.5” (57cm) around up to 25” (64cm) around. If your head is smaller than that, look at one of the Universal adult helmets (such as Bell Slant or Giro Indicator) or any of the multi-size helmets (such as Bell Ghisallo or Giro Havoc).

The Bell Sports company owns the Giro brand, and Bell Sports makes both Giro and Bell helmets. Bell and Giro helmets share many features, but one thing they don’t share is shape. Giro helmets use a slightly oval mold (longer front to back, narrower side to side), while Bell helmets use a more round mold. If your head is large and more oval shaped, a Giro helmet might fit better. If your head is large and more round, a Bell helmet will probably fit better. If your head is of average size, you probably won’t notice a difference and will get a good fit from either brand. In that case pick a helmet based on the features or design or colors you like and don’t worry about the brand—both Giro and Bell are excellent helmets.