I've got a couple questions about the Vibram KSO Trecks Kangroo skin?

Im thinking about getting the VIbram KSO Trecks but im worried about the kangroo skin. Is it breathable? i dont want my feet to get to hot in them. Also how long does it take for these to drie after wahing? is it the same as other VFF? Also why Kangroo skin? Thanks 2 anybody who can help!