Atomic Four AMID helmet is a hugely popular model in our new Four family that brings a totally fresh approach to All Mountain helmet design. Our unique combination of AMID technology and Holo Core offers up to 40% more impact protection than industry safety standards â€“ this helmet will keep you perfectly protected anytime, and in any terrain. The helmetâ€™s position on your head and how snug it fits can be fine-tuned with the 360Âº Fit System. Besides an urban-inspired, low-profile design, the Four AMID helmet also offers a removable liner and goggle clip, which let you ride with beanie and goggles underneath the shell if you want. Stand out, just donâ€™t shout.