This tall kit is for heights greater than 5’8″. ArcaRays are patented foot platforms that give users a one-of-a-kind workout experience. The most obvious benefit is eliminating wear & tear of resistance bands by standing on them, creating friction that wears down the bands. The big benefits include having a contour base that allows for subtle rocking of your feet that develops balance and strength. Another key feature is the ability to reposition the width of your legs/feet during exercise without interruption so you can isolate and target key muscles. Ordinary resistance bands can’t do this. Most of all, you will appreciate being able to control “snapback” that happens when ordinary resistance bands roll off the bottom of your feet and “snapback” at you.