Whatever you call them I love them. Easy to make, warm and you still have the use of your fingers. All you need is a pair of knee high socks, Target has them for $2.50, a sewing machine & a pair of scissors.
Its the same process as the leg warmers, After you finish the edge then pick where you want your thumb hole to be. I did 1.5" from the original edge.
Mark your spot. Fold the side seam in half and snip a small vertical slit the size of your thumb. Done! The edge won't fray so you have no need to finish it! Fold them up, put them in a stocking, or claim them for yourself.