They are the opposite of memory foam. Your head does not sweat, or sink into the latex. You actually sleep “on” the pillow not “in” like MF. You also sleep at a controlled temperature so it’s quite comfortable.
I have a Dunlop one and I love it. I hear Talalay is softer but I have never tried one, also more expensive.
You cannot wash these pillows, so use a good protector on it. And never leave it in the sun. Heat is the enemy of latex.