Vivosmart 4 Black Slate Large Strap Fitness & Training It's made of tear-resistant silicone

It's made of tear-resistant silicone and securely fits your head no matter how many times you wear it

reduced pinching and pulling

Virtually indestructible bar wrapped in EVA foam protects mouth and jawline

Flat knit for comfort

stretch-knit fabric conforms to your knee for comfort and moderate support

Vivosmart 4 Black Slate Large Strap Fitness & Training It's made of tear-resistant siliconeSlim, smart activity tracker blends fashionable design with stylish metal accents and a bright, easy to read display. Includes advance sleep monitoring with Rem sleep and can gauge blood oxygen saturation levels during the night with the wrist based Pulse Ox Sensor. Fitness and health monitoring tools include estimated wrist based heart rate, all day stress tracking, Relaxation breathing timer, Vo2 Max, body battery monitor and more. Display