The Nike Air Zoom SuperRep 2 shoes are designed specifically for circuit training, HIIT and other fast-paced workouts. Layers of support combine with Zoom Air cushioning to keep your foot firm and comfortable as you power through each repetition of jumps and strides. A roomier design around the toes lets you get the perfect fit. An improved fit includes a fully adjustable tongue that lets you step in, cinch down and pour everything you've got into your workout.