These days you can put a cover on almost anything, you can buy covers for your car, your house, your boat, your motorcycle, your books, your pc, … the list is endless. Now a nice company is making spa covers for the spa in your bathroom.
Not having a spa, I wouldn’t have the faintest idea what to do with one, but they look nice. And I guess they keep the dirt out. They might even make extra space for storing stuff in the summer!