YSM reflective slapwrap,arm bracelet are widely use when walking, jogging, and cycling ... be called reflective armband, or reflective slap wrap, reflective bracelet, magic ruler, slap armband ruler, fluorescent armband,wrist band ... ,etc.2) Used when walking, jogging, and cycling,etc.3) Can silk ... like a "crack" reflective slap wraps/reflective bracelet