Whoop

Whoop SportFlex Silicone Wristband, Soft Touch Design, Compatible with Whoop 4.0

WHOOP 4.0 Wearable Health & Fitness Activity Tracker, IP68 Dustproof & Waterproof, Duration of Sleep Stages Measuring, Skin Temperature Continues Monitoring - Black

WHOOP Ultra-Soft SuperKnit Wristband for WHOOP 4.0, 24cm Length, Strength Training Compatible, Enhances Accuracy of Tracking, Comfortable for Sleeping - Moss