Believe it or not, the penny sleeves are UV resistant. I had some cards in fairly direct sun for 2 years + and the ones in sleeves were fine while the unsleeved were faded wherever they were exposed.
The sleeves themselves did poorly, becoming too brittle to handle. But they did stop a lot of UV.
I wouldn't trust that with expensive cards though. Maybe I just got lucky and had a "good" batch of sleeves.
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