Anthem Athletics
Ejis Sweat-Proof Undergarments
Sutran Sweat-Proof Undergarments

Underwear

Make sure they have good support to hold my balls up well for my varicocele.

Supportive Underwear

Boxer Briefs
Y-Front Underwear
Jockstraps

Sweat-Proof Underwear

Sutran
These are good.
Ejis
Works well. Haven't seen any sweat stains yet.
Takes multiple days to air dry. Needs a fan to dry.
Has a slight crinkly sound, but doesn't seem audible.