The Nylon Buckle is elastic enough and the led safety light is light enough to wear without discomfort even when exercising for a long time, it can be worn on the wrist, ankle and arm, suitable for most men and women, adults and children. Suitable for all your favourite outdoor sports, e.g. cycling, jogging, running, camping and walking. Quick to apply and very light, with good quality and comfortable material, the jogging light bands are the perfect addition to reflective items, accessories. Color: fluorescent yellow Material: PVC Package Contents: 2 x Running Armband 2 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.