The Google Pixel 3 and 3 XL are excellent smartphones with cameras that set the bar for mobile phones. They have glass backs with matte and glossy finishes. The Totallee glossy thin Pixel 3 XL case is made of soft TPU material so it provides some drop protection and serious grip.
Totallee also makes a thinner matte case option in clear or black. The glossy clear soft case is available now for $29, which is reasonable for the fit, finish, and protection the case offers. There is no branding at all on the case so you get a very clean experience that shows off the phone as intended. There are microdots on the inside back that prevent the case from causing unwanted watermark effects.
See also: Google Pixel 3 review: Excellent camera, pocketable form factor, and Google software are compelling