I've tried those cute little slipper with the small bits of rubber spots all over the bottom and they wear out fairly fast and even when new can slip.  These socks have great big dots over the entire sole of the sock and they hold tight.  They're a bit big on my feet but I just pull them up.  When doing yogo poses like The Warrior on a slick wooden floor I don't find myself doing an increasing split until I give up or fall-- not fun at all.

I'd suggest these socks for anyone having problems with slippage when exercising, walking on slippery flooring, or need to be more confident that they won't fall.  The sizing may create a problem for people with small feet (but their great for larger feet).  However, a bit of sewing and they'll fit on a smaller foot, though I didn't have to resort to that.

Overall, these socks are excellent for my purposes which is to do yogo and other exercises on a slippery floor without my shoes and without becoming a danger to myself.  Excellent traction.