I got them from Foster and Smith - they were on sale for $8 !
They have little elastics that go under the jaw and behind the ears.
I think they came in "charcoal"
Maggie wouldn't let them be on her for more than about 1/10th of a second! She was pawing at them faster than even she does at her gentle leader!
But Sasha just sat there - wore them on a walk too!