Interesting.
Since Garou MotW was such a late title with respect to the original SNK company (right before the bankruptcy and the subsequent Playmore era), originally there really was not much merchandise initially created for it compared to the previous KOF and Garou Densetsu IP’s. For Garou MotW, there was the initial drinking mug set, official posters, and of course, the usual character statues and figures (both resin and pvc).
In recent years, the current SNK has been selling all manner of printed merchandise including towels like this. However, during all three SNK company eras there has always been a white and blue official merchandise tag or printing that reads: “The Future is Now SNK”, “Official Merchandise SNK Playmore”, “SNK Corporation all rights reserved”, etc, etc.
Both the SNK Playmore and current SNK eras saw Fatal Fury related towel products produced, but they were always branded/copyright marked appropriately.
Though I’ve never seen this towel before, the fact that an official tag appears to be missing is a little odd if this was official.
Of course, there has been a swell of unofficial SNK/Neo Geo branded merchandise on sites like etsy, redbubble, ebay, amazon, aliexpress, etc. so I can definitely understand why you’d want to check it out.