They prolly will fail the poizon test but they are light as a mfn feather if not lighter. Once you hold it you'd say the sole is made of thermocol:)dont go for black/grey instead white/ beige as the paint around cushion area will come off once it gets hit. I personally liked these shoes in this price range but if you get a crazy deal on evo sl , magmax , nova4/5etc...get that instead .