I've read all summer outdoors with my Sony PRS-350s, and they do get too hot for me to touch the metal so that I put skins on them. It's still hot, but not too hot for me to touch. I imagine because the Sonys refresh every page is why that problem never happened. But the screen never starts to do the fading in and out on page turns as treadlightly mentioned also that happens on the Kobo when hot.
I can't remember if PRS+ has a setting to do less frequent page refreshes to test it further. But I thought all e-ink screens were made by the same company, it seems odd there would be differences between devices then.
I've never left my readers in a hot car, they go with me when I leave if I have the reader with me.
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