How a helmet works?
Your helmet is normally comprised of three elements: outer shell, crushable liner, and chin strap. The outer shell, when present, may add load-spreading capacity and prevent objects from penetrating the helmet. The liner, usually made of EPS, absorbs the energy of an impact. The chin strap, when properly buckled and adjusted, can help the helmet remain in position during a crash. Q10: Why replace helmet every five years? The five year replacement recommendation is a consensus position from both the helmet manufacturers and the Snell Foundation. Outgassing of glues which can dissolve liner material, general liner detoriation as a function of hair oils, and body fluids, and normal “wear and tear” all contribute to helmet degradation. Additionally, experience indicates there will be a noticable improvement in the protective characteristic of helmets over a five year period. Thus, the recommendation for five year helmet replacement is a judgement call stemming from prudent safety philosoph
