Sports wearablesNov 2, 2026
Firefly, on repeat: the disposable zap that keeps 750 pro teams coming back
Official homepage: https://fireflyrecovery.com Recovery stores usually sell you hardware that lives on a shelf between workouts. Firefly sells a strip of electronics you stick behind your knee, wear for a few hours, and throw away when its thirty-hour battery dies a deliberately disposable recovery wearable that has quietly colonized professional sports, from NBA and NHL locker rooms to SEC football training rooms, and earned itself a Shark Tank appearance along the way. The premise sounds like a parody of sports-tech marketing: a small adhesive device delivers gentle electrical pulses to a nerve below the knee, the nerve fires the calf muscles into rhythmic contractions, and the resulting muscle pump pushes blood through the legs at a rate the compa …