The crotch seam in underpants and why it matters
Short answer: The crotch seam is the seam that runs through the middle between the legs. When it lies flat and sits in the right place, you hardly notice it. A coarse or badly placed seam can rub and press over a long day, so it is worth checking before you choose.
What the crotch seam actually is
The crotch seam is the place where the pieces of fabric meet at the bottom of the underpants. It is one of the most stressed seams on any garment, because it sits exactly where you move, sit and walk. That is why it matters how it is sewn, where it falls against the body and how much bulk it adds.
Why a crotch seam can be felt all day
When you sit, walk and cycle, the seam works against the skin hundreds of times a day. If it is thick or stiff, it can leave red marks or a burning feeling, especially in warm weather. If underpants have rubbed for no clear reason before, look at bamboo underpants for men and compare cuts and seams.
Flat seams and thick seams
A flat seam lies level with the fabric and makes no edge that the skin can feel. A thick or raised seam is easier to notice, especially in a spot where the skin is already sensitive. Look at the inside of the underpants and run a finger across the seam. If it feels like a clear ridge, you will probably feel it when you wear them.
How to check the crotch seam before you choose
Turn the underpants inside out and see where the seam runs and how many layers of fabric meet there. Gently pull the fabric apart on both sides to see whether the seam gives with it. A seam that tightens when stretched will also tighten when you move. Try them at home with a calm walk and a few squats.
The seam and the cut belong together
Even a neat seam can bother you if the cut does not suit your body. If the underpants are too small, they pull the seam against the skin, and if they are too large, the fabric folds around it. Choose the size by waist and hip. If you also need something for your feet, see all bamboo socks for men and check the toe seam in the same way.
If the seam still presses
If you feel the seam even though the underpants look fine, try another size or another cut. Some men are happiest with slightly longer legs, others with a shorter shape, and that changes where the seam ends up. If the skin stays irritated, talk to your doctor, because there may be causes other than the underpants.
How to wash them so the seam lasts
Wash the underpants inside out so the seam does not wear against other clothes in the machine. Follow the care label and avoid high heat, which can make seams stiff and pull them out of shape. Dry them flat if you can. Look after the elastic as well, since it helps hold the seam in place while you move.
When the seam is worn out
Check the seam now and then. If the thread loosens or the fabric gets thin near the seam, the underpants have had their time. A split seam can rub more than an intact one, so do not wait too long. For everyday wear you can add bamboo T-shirts for men, so that the whole day's clothing is soft and comfortable.
Frequently asked questions
Where is the crotch seam on underpants?
It runs through the middle between the legs, where the pieces of fabric meet at the bottom of the underpants. In some cuts it is placed slightly off centre, so it presses less directly on the skin.
How can I tell if a seam is flat?
Turn the underpants inside out and run a finger over the seam. If you feel a clear ridge or edge, the seam is thick, while a flat seam feels almost like the rest of the fabric.
What should I do if the seam rubs?
Try another size or another cut and wash the underpants as the care label says. If the irritation continues, talk to your doctor, since there may be other causes.
