I've owned Ixtapa and Cancun blue rubber skirted masks for a decade or so, both of which I find comfortable to wear and watertight unless their straps are buckled too loosely or tightly. I've never been to Mexico, nor do I have any plans to visit the country, so I first tried to obtain my Escualo masks by emailing the company in Mexico City, writing to them in pidgin Spanish, as my knowledge of foreign languages is limited to French and German. I received a response, but it was clear from the company's message that they were only interested in large wholesale orders, not in satisfying the requests of individuals. I eventually tracked down a Mexican company, however, which was prepared to take my order and export my masks from Mexico to the UK. The company was Badesports, whose slogan "Todos los Deportes + Todas las Marcas" means "all sports plus all brands" and whose website is at https://www.badesports.net/index.php
and my contact person there was Jonas, whose email address consisted of his name, followed by "@" then "badesportsDOTcomDOTmx". No spaces, replace "DOT" with "." He read and wrote English perfectly and I paid for the transactions via Moneygram. I could also have paid via Western Union. He didn't accept PayPal. Be prepared to be contacted by your national customs agency, or the shipping company acting on its behalf, and to pay some kind of import tax, I was obliged to do so by UK customs and excise, but the amount payable wasn't too large and the delay wasn't too long. Jonas was scrupulous, keeping me informed of the arrival of my payment and the progress of my order. He gave me a shipping company tracking number and I was able to follow the package's progress online.