Well, a car sitting in the Texas sun all day holds a lot of heat, and glass has low thermal conductivity, but is transparent to sunlight, which comes through an

Well, a car sitting in the Texas sun all day holds a lot of heat, and glass has low thermal conductivity, but is transparent to sunlight, which comes through and turns into heat and doesn't escape, ala greenhouse effect. Add high humidity, and sweat doesn't evaporate, causing more sweat. Also, trust me on this, AC has gotten a lot better in the last 30 years. But I guarantee you a non-negligible amount of Houston commuters still ordinarily shower for relief from heat and sticky sweat after getting home from work.