The GFX Genuflex is the sock I turn to when I need something warmer, or my legs are really shot and I need a little more compression. There are both thinner and thicker socks in the line, but these are my favorites for offering a more stiff compression factor than the IQ Fit line and as a result, work out better for really long, strenuous days. Being a bit past it, I don't need that every day, so the easy on-fit of the IQ socks tends to win me over most days but if you want the best performance sock out, this is it. - [tag=105085]@Twig[/tag]