Comfortable Fit: The Apollo Sleep Band provides an unparalleled secure fit for the Apollo wearable on your ankle throughout the night Easy Maintenance: Simple to clean and maintain, the Sleep Band enhances your sleep experience with Apollo Adjustable Size: Fits ankles and wrists with a circumference of 6" to 11" (152mm to 279mm). The total length is 13" (330mm) Durable Material: Constructed from robust neoprene with polyester overlays East Install: For a snug fit, ensure the Apollo device reaches the end of the band D-ring before fastening the velcro The Sleep Band ensures an unparalleled comfortable and secure fit of the Apollo wearable on your ankle throughout the night. Easy to clean and maintain, the Sleep Band enhances your sleep experience with Apollo.