Best Graded Card Sleeve

[newfiesig]

So I've tried the graded card sleeves that a lot of people suggest (Superior Fit Innovations), and while they fit good, they scratch very easily. While not a huge deal, by simply flipping through your collection they become scratched up and take away from the experience of going through your cards.

Does anyone know of a brand that is less susceptible to scratching? I have one here (came with a card I bought off eBay) that is much harder to scratch, so I know they exist (different compositions of plastic).

Suggestions?