FYI hairless cats are not 100% hypoallergenic. They are less likely to trigger allergic reactions because they don't shed fur, but there is no such thing as a completely hypoallergenic cat.

Well, contrary to what you might think, it usually isn’t a cat’s hair itself that triggers an allergic reaction. Instead, people typically react to the cat’s saliva, dander, or natural skin oils because that’s where the major allergen in cats is found. When a cat grooms their coat, the saliva and skin oil spread over its hair. It’s the shedding of that allergen-coated hair along with dander into the cat’s home environment that tends to spark the allergy symptoms.

There are cat breeds that produce less allergens, but no 100% completely hypoallergenic cat.