Fit before and after the first wash
Short answer: At thirty degrees a garment changes by only a couple of percent. At a hot wash it can change by half a size.
What happens in the first wash
During production, the yarn is stretched on the knitting machine, and that tension stays in the fabric until it meets water. The first wash releases part of that tension, and the garment shrinks along its length. After that, the shape is stable if you wash the same way every time going forward.
Why the tension stays in the yarn
The yarn is held taut during production so it can be knitted evenly throughout the whole process. That tension does not disappear on its own through normal wear, only through contact with water and movement in a washing machine, which is why an unwashed piece can feel different from a washed one.
The numbers in practice
At thirty degrees, we are talking about a couple of percent, so under a centimeter on an ordinary t-shirt. At sixty degrees or in a hot dryer, it can reach three to five percent, which is clearly noticeable in both the length and width of the garment.
Do not buy bigger expecting shrinkage
With correct washing, bamboo viscose shrinks so little that sizing up in advance is not justified. Choose your correct size and wash cold from the start. See bamboo t-shirts for men in the size that fits you right now.
Wash it alone the first time
New colored clothing releases excess dye in the first few washes, no matter how well it was dyed at the factory. Wash it alone or with the same color to avoid staining other clothes while the garment finds its final shape and softness.
Differences in drying
Air drying preserves the measurements best, because no extra heat is added after washing. Tumble drying on low heat is acceptable for most pieces, but high heat in the dryer often damages the fit more than the wash cycle itself did.
Why quality affects shrinkage
Dense, heavy qualities generally shrink less than thin, loosely knitted fabrics, because the threads sit closer together from the start and have less room to pull together. See bamboo clothing for men for examples of denser qualities.
How to keep the fit over time
After the first wash, the most important thing is a consistent routine. Do not suddenly switch from cold to hot washing, or the garment experiences a new round of shrinkage that does not happen evenly across the whole fabric.
What to do if it shrinks too much anyway
If a garment has shrunk more than expected, gently pulling it while wet can sometimes correct some of that. This works best right after washing, while the fibers are still soft and pliable. See bamboo clothing for women for similarly good qualities.
Frequently asked questions
Does the garment get softer after the first wash
Yes. Production residue and excess dye wash out, and the fabric feels noticeably softer against the skin. The effect is usually biggest after the very first wash and fades with each wash after that.
Should new clothing be washed before wearing
It is a good habit, both for softness and to remove production residue. This applies especially to colored clothing, where excess dye can otherwise rub off onto skin or other clothes.
Do all bamboo items shrink the same amount
No. Dense, heavy qualities shrink less than thin, loosely knitted items, because the threads in a tight knit have less room to pull together during washing than in a loose one.
You can find the full range at Bamboo-Clothing.com.
