SKYLET for Fitbit Flex Bands, Silicone Replacement Bands for Fitbit Flex with Fastener Ring (No Tracker) PREMIUM MATERIAL--Original material, breathable elastic strap, comfortable for sporting time, nice replacement for lost or damaged wristband. FREE SIZE CHOICE--[Large Size: 6.3-8.3 Inches; Small Size: 5.4-6.9 Inches]. Two sizes (Large and Small) fit your wrist depend on button site you place (Size guide in picture); You don't have to worry about improper size. EXTRA PROTECTION FUNCTION--Silicone fastener rings for free to keep the band from coming loose and falling off. Just enjoy your exercise, enjoy your life. OPTIONAL FASHION REPLACEMENTMultiple different colors and styles for you to choose, match your daily style, creates a strong statement for yourself, sold by SKYLET. WHAT YOU GET: Fitbit Flex accessory bands only, trackers not included. Our fan-favorite 30-Days money back, 18-month warranty for quality-related issues and lifetime friendly customer service.