John,

I wouldn't call tyvek suits exactly "sturdy". I have worn lots of these when cleaning up hazmat spills, and they tear fairly easily if you are actually doing anything while in them. They would be likely be torn up rubble or brush.

On the other hand they are very lightweight, and I can attest that you will certainly be warm in them if you do anything at all, and you will sweat like a pig. They are fairly cheap though, and are meant to be disposable, so depending on your application, they may be a good choice. Just don't be surprised when you rip out a seam or tear them on something, because it will happen.

Greg