Two adjustable Sizes: Large size for 6.7"-8.1" wrist, Small size for 5.5"- 6.7" wrist. Soft Material: These bands for fitbit charge 2 hr are made from flexible elastomer, sweat resistant & water resistant. No Worry about Falling off: These replacement wristbands for fitbit charge 2 design with Metal Clasps on both ends, which locks onto the charge 2 precisely and securely. Hassle Free: Simple to install and remove, NO tool required. 1 year Guarantee: POY provide a wonderful shopping experience, if there is any problems, just contact us and then we will offer a solution by replacement or refund immediately.