When choosing a material for the sock think about abrasion. When I sourced a mesh for the first sock that I made, I used some flyscreen mesh that I already had. The result was that after just 2-3 hoists/douses the spin was showing areas that had slight 'furring' and some threads pulling from seam edges.

I then found some really soft mesh that was quite slippery, in a garden supplies store - I don't know what it would normally be used for - and it has been really good.

The sock on the Stealth is made from Pentex and causes no problems at all, it's smooth and slippery inside and because of its laminated construction stays open well so that the kite doesn't 'stick' as I have seen with the softer Dacron socks.