Some online links use "foot towel" to describe "a small, rectangular towel typically used to dry the feet upon emerging from the shower or bath", while other links use "feet towel" to describe the same thing. So who is right in this context? Thank you 🙏!
With a compound noun, the first part is generally singular, even if multiple of those things are capable of being used or served by the overall compound noun.
This applies not just to body parts (foot towel, eye protection, lung capacity, finger bowl), but to other compound nouns as well (car wash, book club, student center, dog park).