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Engineered for High Performance The SportFlex Accessory Wristband 4.0 is an innovative band crafted from waterproof, sweatproof, and dirtproof silicone. It is extremely durable and built to endure the most demanding workouts and sports activities. Constructed with Soft-Touch Silicone The silicone material is remarkably durable, ultra-smooth, hygienic, and simple to clean. Minor marks can be wiped away, or you can thoroughly clean the band using isopropyl alcohol and a lint-free cloth, then rinse with water. Adjustable & Breathable This wristband incorporates an adjustable closure system for a snug, secure fit. It contains ventilation details for enhanced breathability and comfort. 100% Waterproof The wristband is fully waterproof, making it appropriate for activities ranging from swimming and surfing to high-intensity workouts. Easy to Install It is simple to install and remove, providing convenience for switching between various styles. The package contains the band, hook, clasp, and a Fast Link slider for effortless band swapping. This accessory is only compatible with the 4.0 and 4.0 series. It is not compatible with the Gen 5.0