S1 Helmets never set out to make the most helmets we just wanted to make the best, and our quality over quantity ethos insures that when you buy an S1 bike helmet you are getting the best. S1 Helmets makes high quality bike helmets and bike protective gear. Whether you’re looking for a men's bike helmet or a women's bike helmet or the best kids bike helmet the S1 Lifer is the safest, best fitting and highest quality bicycle helmet available.