WHOOP SportFlex – Compatible with One, Peak, and Life Not with Gen 4 – ECG Compatible, Waterproof, Sweatproof, Silicone Accessory for Health & Fitness Wearable – 24/7 Activity, Sleep, Recovery Tracker

WHOOP 5.0/MG SportFlex – ECG Compatible, Waterproof, Sweatproof, Silicone Accessory for Health & Fitness Wearable - Not Compatible with Gen 4

WHOOP 5.0/MG SuperKnit – ECG Compatible, Signature Performance Knit – Not Compatible with Gen 4