Index Sleep Monitor Size:L/XL We integrated educational tools directly

We integrated educational tools directly onto the racquet to help your kids master the basics of tennis

Mesh details keep the air flowing where you need it most

combining signature colours with a pinstripe design in way that embodies the essence of Borussia Dortmund

Elastic waistband with internal drawcords for customized comfort

DESCRIPTION Lightweight performance 1/4 Zip

Index Sleep Monitor Size:L/XL We integrated educational tools directlyTHE MOST COMFORTABLE SLEEP YOUVE EVER TRACKED For a more comprehensive view of your fitness and recovery, the Index Sleep Monitor is the lightweight smart band that tracks your sleep1 while maximising comfort. COMFORTABLE, BREATHABLE DESIGN WORN ON THE UPPER ARM UP TO 7 NIGHTS OF BATTERY LIFE SLEEP TRACKING AND RECOVERY METRICS BREATHING VARIATIONS THROUGHOUT THE NIGHT SKIN TEMPERATURE TRACKING FOR PAST OVULATION ESTIMATES AND MORE MACHINE WASHABLE