i can't really say which ones to buy, as it really depends on preference and even the keyboard you are using. I would suggest try seeing what size you would like(especially the height) by trying it with other objects.

Then finding something with similar height to match your preference.

Wrist rest on laptop? No thanks, I am good!

Thanks, I will see to it.

You don't see piano players with wrist rests. Just some wrist bands sometimes... Supportive wristbands.

The best thing to do is getting used to typing with a "floating" technique, otherwise you run the risk of suffering from Carpal Tunnel Syndrome on the long run.
Wrist rests are a good idea, but you should not use them while typing.
You will benefit by using them only to be comfortable during breaks, but make sure you lift your wrists again while typing.
If you're wondering how can you be accurate by floating your wrists, the key is in not trying to reach out the keys with your fingers but to shift rows by moving your arm back and forth. That helped me a lot with wrist pain, hope it helps you too!
Keep on typing!

Agreed! Excellent advice.

Wrist rests are comfortable sometimes, especially when your hands, and arms are big, heavy. Muscles weight quite a lot, and instead o wrist rests I use a chair with arm rests that I can regulate, if you spend lots of hours typing like I do, the more comfortable you are, the better. When not trying to type at fast speed, my arm rests are set to a higher position and my wrists are sitting on the rest. When I need to be fast and accurate, I set the arm rests to a lower position and lift my wrists as many suggested before.

Thanks for the advice.

That's a neat trick, thanks.

I have a wrist rest and use it on a 40% keyboard. I found that using one is a good way of making sure you float your wrists above the keys. I just try not to touch the surface of the rest while typing, then when I'm taking a break or thinking about what I might type next, I put my hands on it.

I'm not sure why using one while typing would be that much of an issue. While yes, you could get carpal tunnel from tilting your wrists up, does a rest not raise up your hands so you don't have to angle them upwards?

Thanks in advance,
-Kaiser

As a piano player, I claim this is a broken argument as typing also doesn't require you to move your hands across a meter long keyboard.

This is a response to this thread in general: Although floating wrist is supposedly superior ergonomically, you can definitely just find a wrist rest that is at the height of your wrist when you are floating.

Wrist rests from Glorious PC Gaming Race are quite tall for example.