Mexico 66 design.

Says Jeff Johnson, Nike's first employee,  in a personal communication about these shoes:

"Re: your #16 shoe "BRS Tiger racing shoe". That shoe derived from a shower thong that we cemented to a TIGER "Marathon" shoe upper for a customer. Eventually, that experiment became that shoe, a production model of which was worn by the winner of the 1971 Boston Marathon, after which it was called the TIGER "Boston". I don't remember what it was called before that, and not long after that, BRS moved on to NIKE and no longer carried the shoe. After Eugene's Jon Anderson won Boston in 1973 in an all nylon upper shoe, that blue nylon shoe became the NIKE "Boston". (Bill Rodgers won Boston in it in 1975.)"

See Nike 1 (5-6) in the first Nike Product Catalogue for a photo of the Boston'73: 

https://bit.ly/3wdqe7p