Yes some people do it. The advantages include:
- better grip on the mat for takedowns, guard passing etc.
- protection against foot, ankle and toe injuries (also if you have a pre-existing injury down there)
The disadvantages include:
- harder to escape footlocks
- loss of flexibility and dexterity in your feet, especially during guardwork
So if your game is a top game based on the takedown and guard pass they would probably be advantageous, especially if your guard game is based around getting back to your feet. If you jump to guard right away then I wouldn't wear them
Stephan kesting
www.grapplearts.com