Flat seams in underwear and what they change for you
Short answer: Flat seams lie close to the skin and chafe less than raised seams. You notice it most when you sit, walk or train a lot. Look for flat seams when you choose bamboo underwear, and feel inside to see where they run.
What a flat seam actually is
A flat seam is a join where the edges of the fabric lie in one plane instead of forming a raised ridge. It can be sewn so the edges do not stick up, or joined in a way that gives a smoother surface. You can feel the difference with your fingers if you run them over the inside.
Bamboo underwear and the seams inside
A soft fabric only helps if the seams are comfortable too. When you choose bamboo underwear, turn it inside out and feel where the seams lie. You can see the different models under bamboo underpants for men, where the product description shows what each pair is made of.
Where seams chafe the most
The most exposed places are the inner thigh, the crotch and the waistband against the stomach and hips. Here the seams sit close to the skin and get pressed when you move. Raised seams in these places can cause redness and irritation after a long day, especially if your skin is sensitive.
For everyday, training and long days
Someone who sits still a lot feels a raised seam against the chair. Someone who runs or cycles feels it as chafing. Flat seams reduce the difference, but they do not remove the need for a good fit. Choose a size that does not pull at the fabric and leaves no deep marks.
Labels and tags
Labels in the neck or at the side can cause the same chafing as seams. Many makers print the text directly on the fabric instead. Read what the label says about washing before you remove it, and check that you are not removing information you will need later.
The same in other clothes
Flat seams also matter in other clothes that sit close to the body. This applies for example to a bamboo long sleeve T-shirt for men, where seams at the sleeves and shoulders can chafe under a jacket. Feel the inside and choose clothes where you cannot feel them.
Brands and differences
Different brands build their clothes differently, and the fit can vary from model to model. Look at the range under JBS if you want to compare models from one brand. Always read the description of the individual model before you order, so you know what you are getting.
Washing and wear on the seams
Clothes wear first at the seams, so wash them according to the care label. Use a moderate temperature, avoid hard spinning and the tumble dryer if it is advised against. Turn clothes inside out in the machine, so the seams get less friction and last longer.
Frequently asked questions
What is the difference between flat and ordinary seams
Flat seams lie level with the fabric and do not form a raised edge, while ordinary seams can stick up on the inside. You notice it most when you sit, walk or train a lot.
Are flat seams important for everyone
Not for everyone. Many notice no difference in daily life, but for those with sensitive skin, or who sit still a lot or train, flat seams can make underwear more comfortable.
Can I see the seams in the picture
Often not clearly. Read the product description, look at pictures of the inside if there are any, and check the size guide before you choose.
