Abstract: A slip-on, insulating and decorative cover for bicycle safety helmets is provided by which bicycle helmets are provided with an overall covering complete with integral ear flaps. The ear flaps can be folded down to protect the ears and keep them warm in cold weather. The ear flaps have slots in them, thru which the helmet straps are routed. The decorative cover is readily attached and easily removed from the bike helmet to allow for removal during warm weather or for washing.