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IndyMapper posted on r/xcaret101w
Originally, I had a pair from REI, but lost them somehow. I think they were these: REPREVE edit: Not those, it was actually these: REI REPREVE For another recent trip, I got these others from Amazon: CWVLC (says womens, but we both wore them just fine). Price wise, the CWVLCs were much cheaper and were even better than the REI ones, possibly in part because they fit really well with the UBFEN water shoes we had (i.e. didn't slide down into our water shoes and wrapped around our ankles well to protect them from sand rubbing).