If The Boot Fits...

In both places where I put first-time jumpers in Kangoo Jumps® rebounding boots, I try to get the best overall fit for each person. This includes not just their shoe size, but a variety of other considerations.

The starting place is always the person's shoe size, but that is just a start. KJ boots come in extra-small, small, medium, large, and extra-large, which is enough to fit most adults. (There are also children's boots and heavy duty boots, but I don't work with those.) My personal experience is that the sizes on the official size chart are a "guideline" (like the Pirates' Code), and some people need a size larger or smaller than the chart says. I try for the closest comfortable fit, and tell people to use trial and error in choosing the best sock combination to optimize the fit (thinner socks, thicker socks, two pairs of socks, etc.). The size of the boot is most dependent on the size of the liner inside the boot, and you can put a small liner in a medium outer boot and accommodate someone who is right on the fence between sizes.

The next consideration for most people is the configuration of the t-springs, the things that look like heavy-duty rubber bands inside the two curved shells of each boot. Most brand new boots come with all three bands intact. Cutting or removing the middle band will make it easier to compress the boot, for example, if someone with less weight is using them. Cutting or removing the two outer bands and leaving the middle one intact only works for people don't have enough weight to compress the boot otherwise. The boots are meant to handle a wide range of weights with all three bands in place, and people of any weight who are willing to jump harder can use them. There is even an optional coil spring set that can be purchased and used with the t-spring, for those who want to jump harder or who weigh more.

Further customizing can be done by changing the curved shells on the boots. The three smaller sizes come with L shells, which compress easier than H shells (when used by people of the same weight). The large and extra large boots come with H shells, because people with bigger feet usually weigh more. It is possible to buy replacement shells of the type your size boot would not normally have, and swap them, so that someone with larger feet and a lower weight could compress more, or someone with smaller feet but weighing more could get more rebound effect. Normally you would have to buy your own boots to achieve this level of customizing, but sometimes you will find a location that has a medium boot with H shells.

Whenever I put first time users into rebounding boots, I try to match as many of the shoe size, weight, and fitness level criteria as I can, to ensure the best "ride" for them that day. My theory is that the better the boots fit, the more they will enjoy it.  Once they try it and fall in love with rebounding, they can buy their own boots and customize them to their heart's content.