Capsaicinoids are the group of compounds responsible for heat, with capsaicin being the main contributor
In a nutshell, Americans excessive consumption of these oils (such as soybean oil, canola oil, corn oil, safflower oil, cottonseed oil, and sunflower oil) is now believed to be largely responsible for the rise in liver disease, heart disease, obesity, allergies, asthma, mental illness, bowel disorders, and cancer (more references and information can be found in my favorite, most trusted diet book called the Perfect Health Diet, in Chapter 11: The Dangerous Fats: PUFA)
In the past, the classic fit was popular for two reasons
Slip-on shoes are quite versatile and can be worn with various types of shorts, including chino shorts, denim shorts, or even swim shorts for a beach look