How light do you want to go? the absolute lightest are the Inov8 286 Gtx (I have a pair of the previous 288 Gtx) and they are definitely featherweight. I have them for hand luggage when I need to wear a suit on the plane. A pair is less than 600g (so much less than the Altbergs for instance) but still gore tex waterproof. Personally for most things I'd have a little more weight.
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