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Product Detail Material: Silicone Size: Small ( 5.5"-6.7" ) Large ( 6.7"-8.1" ) Product Feature Specially designed for Fitbit Charge 2 activity tracker. Made of soft silicone gel materials, environmental and non-toxic for comfortable wearing. With air holes works well for breathability and lightweight for daily wear. With stainless steel buckle make it easy to adjustable to the length you want. Waterproof and swear-resistant, perfect for summer hot day. Multi-color and two size for different needs, personalize your watch and make you have a good mood.