Compatibility: The belt is only compatible with my band 7/ my band 6/ my band 5. Note: Not applicable to any other model. (Does not include electronic product) Adjustable size: This clock strap has a perforated design that can be easily adjusted to the size you want. It adapts to the size of the wrist: 5.5 -8.5 (140 mm-216 mm), adapts to the majority of men and women. Premium material: the belt is made of sweat-resistant silicone, to the dust and water, which is resistant to wear and deformation. Light and soft to the touch, it provides soft damping during high intensity training. Durable, comfortable, easy to use and clean.