Amphipod Stretch Bright Arm Band. Ultra-bright reflective fluorescent band adjusts to fit wrist or ankle for high visibility while you run, walk, or ride at dusk or dawn. Adjustable, soft and chafe-free with stretch-fit comfort. Amphipod Full-Viz Flash™ Clip-On LED can be purchased separately for lighted/flashing/strobe visibility. Stretch-Bright™ band fits wrist or ankle up to 12" around.