The first iteration of these socks had the criss cross all around the sock and they really weren't stretchy enough. So I ripped out (which hurt my soul a little bit because they were past the heel) and started again. I added the garter to the back so that the sock would have enough stretch to go over peoples heels but it also doesn't knit as 'long' as stockinette stitch does. When you are finished with the sock the garter sucks down a littler further than the criss cross does. Once I washed them I didn't have any trouble.
The yarn used is a merino nylon blend tonally dyed to show off the stitches. Any wool/nylon blend of sock yarn will work. My testers used a variety of different dye styles you can see them here on Ravelry. You can try using a 100% wool fingering weight but I like having nylon in them for some strength.