Boots of Heaviness

So I thought about this and I thought since a knock up stops you from doing anything, maybe there should be a counter. So I came up with the Boots of Heaviness. I thought it would have...

"Unique-Enchanted Movement: +30 flat movement speed" "Unique-Grounded: Negates airborne effects and displacement. (180 second cooldown)"

The boots are an upgrade of the Boots of Speed. They cost 1000 Gold. One problem I see is the few champions that have knock ups need knock ups to engage or deal damage. However, I feel this is balanced with the lesser movement speed, the fact that there's still some crowd control, and that the champion that buys these boots loses any benefits from their normal pair of boots.

Edit: Added a cooldown. I thought about it, but I thought the loss of benefits would negate the need of a cooldown. Also, I added something else.