I'm 5' 9". it's not a shinguard so your hight shouldn't matter.
The top strap is a lil short, so if your leg is more than 15" - 16" (around), at 3" above your kneecap, the small won't fit you.
They look like this without the "
SIXISIXON..."
...everything i try is too small for me cuz I have extra long shins...
You should try this (if it fits), plus a seperate shin guard.
I had the same problem too. I'm skinny, & average height, but my legs are long.