Okay, so they're not a sexy as a new race suit, but equally as important for fire protection.
This pair of Nomex ankle socks from OMP hit the mark. The fit is dead on (small for shoe size 9). The toe to heel length is perfect so there's no bunching of material in your shoe.
They are soft enough that they don't feel like a dress sock, and are reasonably breathable.
Don't bother with the CarbonX. They are uncomfortable and are not very durable.
So next time you're lacing up to climb in the racecar, look down. Been a while since you replaced yours? Do they look brown and shrivilled like a piece of beef jerky?
Go ahead an order a couple pairs of these bad boys. Your feet will thank you.