Keep that slim profile of the Galaxy S9 and S9+ with these thin cases
(Android Central)

If you want to maintain the sleek form factor of your Galaxy S9 or S9+, but you still want to at least protect it from scratches and scuffs, then a thin case is the best way to go. These are the best you can buy for your phone. Lightweight protection Spigen Thin Fit Staff Pick This case offers excellent scratch protection with a bit of drop protection, thanks to reinforced corners. There`s a raised lip around the screen, as well as the fingerprint sensor and camera, and there are precise cutouts for all the buttons and ports. You can snag this in black, blue, or purple for both the Galaxy S9 and S9+ (which also has a gold option). $12 for S9 at Amazon $10 for S9+ at Amazon No bulk here Totallee Ultra-Thin Case Totallee is another one of those companies that makes cases that are so thin you barely realize they are there. This line of cases comes in four different colors, measures in at just 0.02-inches and is available for both the Galaxy S9 and S9+. $13 for S9 at Amazon ...