Most men wear their underwear for up to two days before washing them
From the same study, 1 in 5 men never wash their underwear.... ever
For max sperm production, your testicles should be 2˚ cooler than the rest of your body.
Try one pair and be ready to replace your whole drawer. Seriously.
4 WAY STRETCH
Move around, this has 4-way stretch and is form-fitting, but does not constrict at all.
And generally amazing.