The neckline that goes slack
Short answer: The neckline goes slack when the top is pulled over the head many times and when it is tumble dried. The rib loses its grip and does not come back.
How it wears
Every time the top is pulled over the head, the rib is stretched. That is normal wear, but heat speeds it up.
Tumble dryer
The heat destroys the elastic in the ribbed edge faster than anything else. See the washing guide.
Do not hang it by the neck
Never hang the top up by the neckline. Use a hanger or lay it flat.
Can it be put right
A wash at 40 degrees and drying flat can give a little back. If the rib is fully stretched, that does not help.
Turn the top
If the top is washed inside out, the edge wears less.
See the range
See the basics in bamboo t-shirts for men.
See also
More on the subject in how your t-shirts keep their shape.
When the top is used up
A slack neckline is often the first sign that the top is nearly finished. If the fabric has become thin at the same time, it is time to replace it. See bamboo t-shirts for men.
Frequently asked questions
Why does the neckline go slack?
From wear when the top is pulled over the head, and from heat.
Can it be put right?
Partly, by washing and drying flat. If the rib is fully stretched, that does not help.
What wears it most?
The tumble dryer.