I have been a big fan of screen protectors for my digital devices, all my latest ones have been tempered glass. I've used them on my Galaxy notes 4, 8, and 10.1 2014. When I got my Samsung Gear (original), I immediately searched for glass, but couldn't find any. I have a feeling it was because the face is slightly curved. I tried a typical flexible plastic one, but it kept falling off. I decided to go commando, and not use one. I've been wearing my Gear quite a while, and have bumped it a few times, but it still seems fairly pristine.