Pink / Black Adjustable Neoprene Workout Sport Armband for Samsung Galaxy S4 i9500 Adjustable closure fits many arm sizes; Slim, lightweight, and stretchable neoprene material. Full screen protector allows full touch screen functionality. Made of neoprene material, keeps your phone safe when you are exercise. Provide excellent protection during sport, such as running, biking, jogging, walking, working out etc. Refective strip provides more visibility under light for your safety.