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Later, the United States Consumer Product Safety Commission (CPSC) created its own mandatory standard for all bicycle helmets sold in the United States, which took effect in March 1999.A 2004 report concluded that the performance requirements of the 1996 version of this standard was slightly less strict than the Snell B95 standard but incorporated a quality assurance requirement, making it arguably safer.Snell's standard includes testing of random samples.There are two main types of helmet: hard shell and soft/micro shell (no-shell helmets are now rare).

Because some helmet materials deteriorate with age, the Snell Memorial Foundation recommends that a helmet be replaced at least every 5 years, or sooner if the manufacturer recommends it.The first serious attempt by the UCI to introduce compulsory helmet use was 1991 Paris–Nice race, which resulted in a riders' strike, and UCI abandoned the idea.While voluntary helmet use in professional ranks rose somewhat in the 1990s, the turning point in helmet policy was the March 2003 death of Andrei Kivilev at the Paris–Nice.The dominant form of the helmet up to the 1970s was the leather "hairnet" style. Two of the first modern bicycle helmets were made by MSR, a manufacturer of mountaineering equipment, and Bell Sports, a manufacturer of helmets for auto racing and motorcycles.This offered acceptable protection from scrapes and cuts, but only minimal impact protection, and was mainly used by racing cyclists. These helmets were a spin-off from the development of expanded polystyrene foam liners for motorcycling and motorsport helmets and had hard polycarbonate plastic shells.

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