The ECH’s profile is very similar to the Advanced Combat Helmet but is thicker. The helmet’s shell is made of an ultra-high-molecular-weight polyethylene material. It must protect 35% better against small-arms fire and fragmentation than the Advanced Combat Helmet. The helmet is required to protect against certain rifle projectiles. The helmet is of the “tactical cut” type and thus offers less coverage but does enable better mobility. The helmet will be compatible with camouflage fabric helmet covers. The replacement of the Advanced Combat Helmet with the Enhanced Combat Helmet has been likened to the transition from the Humvee to the MRAP.