2 designs
Go merch
The gopher, the language, and a mascot that predates both.

Go Gopher
Renée French's gopher, drawn at print resolution rather than scaled up from a web asset. The buck teeth and the wide-set eyes are the whole character, and they survive the trip to fabric.

Go Logo
The Go wordmark in heavy black, with three speed lines trailing off the G. For people who like the language but have never especially wanted a rodent on their chest.
The Go gopher is the rare tech mascot with a documented artist and a licence attached. It was drawn by Renée French, an illustrator and cartoonist whose work long predates the language, and it arrived with Go’s public release in 2009.
The gopher itself is older than Go. French had drawn an earlier version years before, for promotional material for the radio station WFMU, and the Go gopher is a descendant of that character rather than a fresh commission. It shows: the buck teeth, the wide-set eyes and the slightly bewildered expression belong to an illustrator’s sensibility rather than a design agency’s.
The licensing matters if you make things. French released the gopher under a Creative Commons Attribution licence, which is why gopher variants are everywhere — conference mascots, project logos, plush toys — in a way that tightly-controlled corporate marks never are. There are gophers dressed as every profession you can think of, and the community treats redrawing one as a standard bit of fun.
That openness is part of why the gopher has outlasted a lot of flashier branding. It was built to be copied. The designs here are drawn at print resolution rather than scaled up from a favicon, which is a lower bar than it should be.