The idea of socks is to put extra pressure on your carotids. It would ideally mimic your thumbs pressing in on your arteries. However, in practice, I could not get them in position and get the rope in place, and they really did not do much. I just went with some general padding around the rope, so it did not put too much pressure on my trachea.
Everyone's anatomy is different, however, so you just need to try and figure out what works best for you.