a bicycle helmet is disclosed having a flexible , articulated member depending from the rear of the helmet , providing a closer fit to an individual wearer &# 39 ; s head and improving stability of the helmet on the head , particularly for mountain bike riding . the articulated member contacts the wearer &# 39 ; s head beneath the occipital region and applies a forward and upward pressure against the head . the general embodiment of the invention includes an elastic strap stretching from one side of the helmet , across the back of the articulated member , to the opposite side of the helmet . adjusting this strap allows the wearer to adjust the forward and upward pressure exerted by the articulated member on the wearer &# 39 ; s head .