I live in the greater North and can only get on the road when it is dry. Hey, what can I say; life on the farm.
This capsule looks like the nut.
Do you have to buy one each year?
Can you open and close the bubble at will?
Is it reusable each year?
Or, in a nut shell, how does it work? Other than it looks like a plastic bubble inflated by a vacumm cleaner.