In reply to agray:I don't know of any boots, but I guess the best thing to do is focus on healing well.
Looking into how tension and things in other parts of the leg (and any other causes) can play a part in achilies tendon injuries could be a good idea for when you've recovered again, I think stretching calf muscles is often reccomended to help to sort out achilies tendon strains. I suppose it snapping sounds like it just wasn't strong enough for what you were doing.
Hope you're seeing a good physio and things.
Cheers
Tim