First, touch by hand
If it is soft and comfortable to the touch, it is most likely pure cotton or high cotton content. If the hand feel is too hard, then the fabric has a low cotton content.
Second, grasp hard
The elasticity of the pure cotton fabric is relatively poor, and it is prone to wrinkles. When buying, hold it hard. If there are many wrinkles, then it means that the composition of pure cotton or cotton is high.
If the shrinkage is particularly serious, it means that the T-shirt is not pure cotton, and it may be mixed with other fabrics.
It can be seen that pure cotton fabrics are relatively easy to distinguish. When you buy T-shirts, it is best to buy pure cotton or high-cotton T-shirts. Such T-shirts are comfortable and breathable to wear.