Compatible Models: The silicone band is compatible with Fitbit Charge 5/Charge 4/Charge 3/SE; All-round protective case design band makes your watch device not be faded and make it corrosion-resistant and durable. (NOTE: The Tracker Device is NOT included). Skin-Friendly Material: Compatible with Fitbit Charge 5 watch bands are made of eco-friendly silicone and covered with anti-dust surface oil makes it as soft as baby skin. No harm to body, and protecting the Charge5/Charge4/Charge3 tracker device from dirt and scratches. Band Size: One size fits for 5.6"-8.5" wrists; The size can be adjusted according to individual wrist. Perfectly fit for runing, swimming, riding, workouts, parties, climbing, hiking, traveling and more outdoor activities. Provides your wrist maximum comfort and breathability. Install Adjust Simply: This one-piece case with wristand is super Easy and direct to install and one button removal. Strap with bumper case create a unique style. Never going to loose and fall off. Safe Butterfly ClaspThe safety butterfly clasp on the band for Charge5 makes it more convenient and beautiful to wear. Simple and stylish look, perfect for running, climbing, cycling, party, work and other occasions. You needn't worry about its falling off and losing your tracker.