Hairless (hr/hr) mice are mice who have no hair. There is a picture at the bottom of this AFRMA page: http://www.afrma.org/micevar.htm
There are other varieties of hairless as well, such as fuzzy hairless (fz/fz), which do often have some fur, but nowhere near enough to be what you described.
I would not get animals from somebody who had them so blatantly mis-labeled. Some things are understandable (for example, calling a light himalayan a PEW), but not knowing the difference between hairless and furred mice seems...suspect to me.
There are other varieties of hairless as well, such as fuzzy hairless (fz/fz), which do often have some fur, but nowhere near enough to be what you described.
I would not get animals from somebody who had them so blatantly mis-labeled. Some things are understandable (for example, calling a light himalayan a PEW), but not knowing the difference between hairless and furred mice seems...suspect to me.