I waited until the sale to get the rough-ground ones. Which they didn’t have in Bird size, so I went to HugeSouthAmericanRiver who had the same price.
But I now have, hmm, five pairs of the blessed things, and I think that is Enough.
(Slippers, normal pavement, old ones for the garden, rough-ground, and the sandals for maximum padding for trade shows.)
TFM, maybe yer supposed to hide a hip-flask in the hollow sole?