SUPOW&reg; Accessory Band for Fitbit Alta, Adjustable Replacement Bracelet Sports Wristbands Straps with Metal Clasp and Metal Dome For Fitbit Alta Smart Fitness Watch (No Tracker) Designed for Fitbit Alta, and perfect replace your original band. Wristbands small size: 5.4-6.9 inches; large size: 6.3-8.3 inches. Classic colors to change your look in an instant. SUPOW Fitbit alta bands is made from TPU material. It is comfortable, eco-friendly and safe for the human skin. Comfortable, durable materials make these bands your go-to accessory through exercise, sweat, sleep and beyond.