They don't?!?
this post was submitted on 09 Aug 2026
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No, some people use them as intended.
Go look at the shorts. Why is the manufacturer spending the time and money to put a nice, soft piece of fabric where your taint is touching? If the intent was you just wear your regular underwear they wouldn't bother with that nice bit of fabric. But your bare skin is meant to be in contact with it, hence the nice soft material to limit chaffing and absorb sweat.
I do.
I remember seeing a little blip saying as much at REI.
you wash it after every ride anyway. on the plus side, you get no underwear rashes that you would definitely get if you wore underwear.
and my personal favourite reason: your underwear doesn't "cut" int your belly.
My understanding is that unlike undies the bike shorts don't have seams that will rub as you pedal so they're meant to be used as the base layer.
I had never thought about seams, thanks!
Let me ask a parallel question:
Why don’t people wear underwear under their swimsuits?
That one is more clear to me: a soaking wet underwear is not comfortable.
Also, swimsuits do not seem to atract body odors. If anything they get chloriny
underwear under bike shorts would also be soaking wet though.
😏
Hasn't been for me but maybe I'm not riding long enough.
Maybe if the underwear is not wet, it's not time for bike wear. This is for endurance and sweat management.
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(1 replies)
Why would that be necessary, like Mamil, I wash those padded shorts after each use.
What is Mamil?
Middle aged men in Lycra.
Thanks!
Chaffing and moisture management. Underwear is more often than not cotton. Putting a layer of cotton between you and the lycra would trap moisture. And yeah, the chaffing would be unreal.
You don't. Any more layer of fabric will cause friction and might lead to blisters or worse.
The rule is never wear underwear under bike bibs. But I am a man, women sometimes do wear underwear, guess it's more of an hygiene matter for them.
As for comfort, i confirm by first hand experience that it's much better WITHOUT.
YMMV
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(14 replies)
Nothing, and I repeat, nothing prevents stink if you're not washing after every ride.
I do that and they're still stinky.
Chaffing. On a long ride, I have to put a lubricant on the bike shorts (I use Chamois Butt'r) as well, which you don't want to rub into your drawls. Most clothing just isn't built to rub against your body for 10 hours continuously.
Someone gave me body glide, but I didn't know where i was supposed to put it.
On the seams, where the chamois meets the short. Put a liberal amount anywhere the fabric isn't perfectly smooth.
Friction. For extremely long rides (100+ miles), you want the least amount of friction for the least amount of chafing. I use chamois butter in my shorts too to cut it down even more.
Chaffing.
Clean yo ass. Wash the shorts regularly. You'll be grand.
But seriously, clean yo ass. Like get right up there.
Dangerous click of the day
Do you not wash clothes?
I do. I still don't like getting poop on clothes if i can avoid it, hence underwear.
Ignoring possible medical conditions; that seems like a fairly easy problem to solve.
Do you know something I don't? I use a bidet, I wipe. I shower. But still my underwear smells like ass. I figured this is the point of underwear: to protect the clothes.
Yes, underwear will help keep you from getting poop on your bike shorts. No, underwear will not keep ass sweat and smells out of your bike shorts for more than a couple minutes. So it depends on use case. As long as you are dingle berry free, an extra layer of fabric isn't going to help much for smells.
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You are not eating enough fibre.
Because it adds an extra layer of heat and friction.
Dunno about you but the boxers get soaked. They would be very little to prevent the shorts from also getting sweaty.
I guess that sorta happens on long rides.
Same reason you don't you wear underwear under your underwear.
I have lots of underwear, only few bike shorts.
I wear underwear to protect clothes.
I don't wear underwear under underwear because i don't need to protect it.
So it must be a different reason from that.
That would defeat the purpose of the shorts
What is the purpose of the shorts to you?
Wet wipes, bro. They'll change your life.
I never felt good about the waste.
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