Sphynx cat
Hair lack in Spnynx cats don't make it hypoallergenic. Allergies however are quite limited due the environment hair lack.
His body temperature is slightly higher than hair protected counterparts to offset this disadvantage. A body fat layer helps them to keep warm.
However, always they are not up on you they will easily seen near heat sources. They love it. And even they love summer sun for a while. Needless to be worried for the sunlight that they take, so they are already dealing with the shadow when they have had enough.