Specialized Ambush Comp is a wallet friendly version of Specialized’s premium helmet. It shares a very similar low-profile as the £30 more expensive model.

>>> Click here to find the best mountain bike helmets

The Ambush Comp has a less sophisticated hardshell construction and more EPS foam liner exposed at the edges to save cash.

This polystyrene foam is single density, but reinforced by a Composite Matrix (internal webbing) to manage impact energy better in an accident. Spesh’s 360-degree wraparound fit system is unique in how a small dial in the outer rear edge of the actual helmet cranks tightness in all around the head. It’s effective at squeezing the skull and has a five-position height adjustable cradle that effectively tunes tilt and where the rear webbing locks into the nape of the neck.

There’s minimal padding inside, but it’s perfectly placed and comfy next to the skin, as well as being really thirsty and absorbent. The Ambush peak moves on a ratchet and is stable and quiet with plenty room for stashing goggles underneath, plus it’s impossible to set crooked and accidentally get that twisted visor look.

The Ambush Comp sits great on the head, with a really light feel and superb ventilation. There’s a sense air literally whizzes through the big holes and it’s unobtrusive to the point you forget soon you’re wearing it. One complaint for some, however, is in terms of fore and aft stability. There’s a sense it grips the sides of the head more than the front and back and on the roughest trails or landing heavily it can pitch forwards. That exposed EPS rim is prone to damage too.

Still, provided it’s stable enough on your head shape, this £85 lid is one of the best-ventilated helmets we’ve used and feels super lightweight while riding.