Xtrac Mouse Pads
 

From a technological standpoint, there are several points that distinguish these pads. First is the top sheet. This is either cloth or plastic with a printed hexagonal pattern (except the Ripper XL, which doesn't use a pattern). The underside uses either Sure Grip or Sure Grip II backing. Sure Grip is used on the 1/8" thick pads and is basically a zigzag pattern of rubber rectangles. Sure Grip II is used on the credit card thin pads and while it doesn't use any sort of pattern (due to thickness constraints), it still does a fine job of not slipping. Granted, it's not as good as the thicker Sure Grip backing, but the difference is negligible and you do have other options.

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