Can't seem to find anywhere through google

Just came across the idea of making a http://www.tothewoods.net/HomemadeGearHammockSock.html but lining it 3/4 with insultex.

I saw the MollyMacPack ones but I prefer the simpler design on Jeff's page and it *seems* like it'd be easier as a DIY project considering my newb status on a sowing machine