Actually Sapphire display size

38mm fits fine yes.

It's what I have on mine, gets close to the edge but with just a tiny enough gap to make sure that as long as you centred it well, it won't lift up at the sides.

Specifically for the 5X

http://www.protectionfilms24.com/article/brotect-airglass-premium-glass-screen-protector-clear-garmin-fenix-5-2731233.html

I've ordered a bunch of screen protectors from them. Shipping is fast, and great prices.

I use fenix 3 screen protector with my fenix 5x and it's exactly the same screen size.

https://www.youtube.com/watch?v=FiqMYWTDACU

I couldn't finish watching it.....sorry, I'm faint-hearted.

I couldn't finish watching it.....sorry, I'm faint-hearted.

Sorry. I know the OP didn't ask for opinions on whether needed or not, and no offense intended by suggesting otherwise. I just think a screen protector is completely unnecessary on Garmin's sapphire crystal devices, which have been well proven to be scratch proof with any ordinary and many extraordinary items. Not sure what would scratch them, and personally I think the screen protector could only reduce the sharpness of the screen.

Sorry. I know the OP didn't ask for opinions on whether needed or not, and no offense intended by suggesting otherwise. I just think a screen protector is completely unnecessary on Garmin's sapphire crystal devices, which have been well proven to be scratch proof with any ordinary and many extraordinary items. Not sure what would scratch them, and personally I think the screen protector could only reduce the sharpness of the screen.

A tiny dust particle and a cleaning cloth is all it takes to scratch a screen. The more you wipe your screen with a cloth the more likely is to get a scratch. All these tests with knifes, keys and coins are pointless.
A sapphire screen will of-course not scratch as easily but due to its hardness its very likely to shatter on impact or drop, which is something you can avoid with a screen protector.

A tiny dust particle and a cleaning cloth is all it takes to scratch a screen. The more you wipe your screen with a cloth the more likely is to get a scratch. All these tests with knifes, keys and coins are pointless.
A sapphire screen will of-course not scratch as easily but due to its hardness its very likely to shatter on impact or drop, which is something you can avoid with a screen protector.

It's true anything can scratch. It's been well proven on sapphire crystals though that the only things that will scratch them are another sapphire, a diamond, or silicon carbide, which are unlikely to be encountered by the wearer. I'm sure under a microscope even a Rolex with sapphire crystal will show scratches, but they are invisible to the naked eye and do not disturb the apparent light transmission from the display. The Mohs scale hardness of sapphire also means it's true the sapphire is more "brittle" in some circumstances. But the bezel on the Fenix line as on many watches prevents the direct hit from a very hard object needed to shatter the crystal. A screen protector film or glass does however create a pocket where material can accumulate and will in turn damage the inside of the bezel over time since most folks can't/won't keep the accumulation out of the area.

It's true anything can scratch. It's been well proven on sapphire crystals though that the only things that will scratch them are another sapphire, a diamond, or silicon carbide, which are unlikely to be encountered by the wearer. I'm sure under a microscope even a Rolex with sapphire crystal will show scratches, but they are invisible to the naked eye and do not disturb the apparent light transmission from the display. The Mohs scale hardness of sapphire also means it's true the sapphire is more "brittle" in some circumstances. But the bezel on the Fenix line as on many watches prevents the direct hit from a very hard object needed to shatter the crystal. A screen protector film or glass does however create a pocket where material can accumulate and will in turn damage the inside of the bezel over time since most folks can't/won't keep the accumulation out of the area.

^^^^ +1

Sorry. I know the OP didn't ask for opinions on whether needed or not, and no offense intended by suggesting otherwise. I just think...

And that's how it all starts... ;)