My son is 6'1" and is using the large legs. If he grows anymore we'll be buying the next size up. Those will fit him now, they are just a little big and clumsy where the current size is just right. I would recommend trying on someone else's just to make sure.
As Senna mentioned, their customer service should win an award. They truly care about their customers and take pride in every set of gear they send out. A few years ago my son had a clip fail within a week of purchase. They overnighted a "loaner" set until his custom replacement was ready. Once ready they told me to keep the loaner set. They also sent me a pre-paid box to ship the old ones back so they could examine them and see why they failed.