Thick condoms are condoms manufactured from a slightly heavier material, latex or otherwise. Some people prefer thicker condoms for their added strength, as they are less likely to break. An intact condom is of course more likely to prevent unwanted pregnancies or disease transmission.
Some men find they can last longer during intercourse with the somewhat desensitizing effects of a thicker condom. Thus, they are often used as an aid to prevent premature ejaculation.
Another market you might want to access is the female-to-male transgender male (transmen). Some of the surgeries available to create a phallus do not include the ability to achieve an erection. The extra thick condom is a great solution for guys who need a little bit of help with stiffness and do not want to pay for the expensive and invasive penile implants that biological males use to treat ED. There are a lot of transmen out there and you could certainly sell a lot of extra thick condoms if these transmen knew about the product. Take care, Adam.