One of Twelve South’s earliest accessories, SurfacePad ($30), has been redesigned for 2013. Now available for both sizes of the MacBook Air, as well as 13” and 15” non-Retina MacBook Pros, the already minimalistic design of the leather palm rest has been slimmed down even further. Why isn’t there a Retina version? Twelve South links to this Apple article, which says the tolerances are too tight for such accessories.