Leisesturm

I haven't studied their helmets enough but the physics and properties of liquids and gels is enough to inform an opinion that the 'gel' technology helmets are using the gel mainly as friction reduction to isolate rotational forces from the head and neck. That could be done entirely with a lower density foam than the main liner but gels are hot right now. Gels are in your saddle, your insole, your shorts, your snacks ... why not your helmet? If I was late to the Patent Office for a filing on a pure hybrid gel/EPS shell liner I may well throw in some lower density foam with the gel pads in some kind of proprietary matrix, give it a catchy name, trademark it, and go catch customers with it.