Product review (5 stars): The Key is Sorbothane!
These aren't just feet.
If you want feet, there are some nice recycled rubber ones that won't keep your washer in place.
These have a generous layer of Sorbothane rubber which stops the transmission of vibrations from the washer's feet to the floor.  Not only will it anchor the feet in place, but it should also cut down the noise transfer to a wooden floor.
My washer hasn't walked since I got them.