WHOOP SuperKnit – Compatible with One and Peak – Comfortable, Everyday, Signature Performance Knit Accessory for Health & Fitness Wearable – 24/7 Activity, Sleep, Recovery Tracker

SuperKnit is made with an ultra-soft backing and microfilament yarn that moves with you. With a completely adjustable band, you can easily tighten or loosen SuperKnit to find your perfect fit.