Can Wearing Under Armor Lower Sperm Count?

Yes, it certainly could lower your sperm count a bit, but you should be O.K. if you have a naturally high and healthy count in the first place.
If you must wear tight fitting clothing for so long, try to counter this by allowing your testicles to stay unconfined as much as possible for the rest of the time. Wear loose fitting boxers and pants and sleep naked if this is possible.
Road racing cyclists, who wear lycra or spandex shorts for many hours at a time, are high on the list in fertility clinics, when they want to become fathers.

It may lower it slightly, but not by much. Unless you’re going to start wearing them 24 hours a day. And even then it wouldn’t lower the sperm count as much as you think. This thing with tight pants lowering the sperm count was really overblown in the media.

It’s true that the testicles work better when they are at a lower temperature, which is the whole reason they hang outside the body in the first place. And holding them up against the body will increase their temperature. But not by that much if the fabric over them can breath – which jockstraps and spandex shorts are made to do.

Plus it’s note even like it’s permanent or anything. Even if your sperm count was lowered a bit by wearing tight pants all the time, once you started wearing looser pants it would go back up. Think about it – if sperm counts were lowered by that much people wouldn’t have to use condoms or the pill for birth control anymore. A guy would just have to wear tight pants and he’d never have to worry about becoming a daddy!

And cyclists don’t have problems due to the spandex shorts they wear. The problems are from the pressure from their weight pressing down on that very small seat. It pinches nerves and blood vessels that feed into the base of the penis and the testicles. Long time cyclists have higher than average rates of erectile dysfunction.