Perfect match with Whoop 3.0 and 4.0: Enhance your heart rate monitoring experience with our armband changes, designed to fit seamlessly into Whoop 3.0 and Whoop 4.0 devices. Enjoy hassle-free upgrades to enhance your fitness tracking.

Ultra-light, soft and skin-friendly materials: Ultra-light and soft materials provide unparalleled comfort. The arm strap is gentle on the skin, making it a pleasant wearing experience for all kinds of activities.

Charging simple design: Experience unprecedented convenience. Our unique design reduces the thickness of sensor mounting points and allows direct charging without disassembly. The unique design does not affect the accuracy of the sensor.

IP67 waterproof and durable: Let you exercise with confidence. Our armbands feature IP67 waterproof protection, making them elastic and protecting against water exposure. Unique materials ensure durability and keep up with your active lifestyle.

[Adjustable size · Easy installation] Adjust the band according to your preferences, adjust the size to ensure easy and safe fitting. Easily install and remove belts, providing flexibility for users of all sizes.