ESR Armorite Screen Protector for Apple Watch Ultra 3 2025 /Ultra 2 /Ultra (49 mm), Military Grade Protection, Tempered Glass Film with Aluminum Alloy Frame, Anti-Scratch, 2 Pack, Black

The only “case” you might need with an Ultra 3 is these screen protectors from ESR https://a.co/d/0hOkpniT

Get a screen protector like this one. Bezel is protected. And it doesn’t look like a case is on it https://a.co/d/01xxvnnv