This is a very niche product but there are at least a few guys out there who wish they had it back when their kids were babies.
It's called FridaBalls. And it's a pair of men's boxer briefs with a reinforced crotch. Why? So when you're wearing your baby in a baby carrier and his legs are flying, you won't be in horrible pain when one inevitably whacks you in the junk.
They cost $28 for a pair.