The material is in the front part of 89% polyester and 11% spandex. The back is made of 100% polyester. Both materials are perforated throughout. The shirt is thin and light. It weighs only 112 grams.
It is washable at 30 degrees and for the dryer, where it does not need to, because the shirt is dry in half an hour.
The workmanship is very good, far sewn clean, no protruding threads.
Since it is my husband too tight, I've tested it (while running). I wear a size S, partly M. For me, it fits like a second skin, the section corresponds to the female proportions in no way, unless a woman has boyish figure.
I found the compression effect very pleasant. Super is that you despite not sweat shirt wet to the skin (on the back and under the armpits) must tolerate because moisture evaporates immediately.
I had a small bag, z. B. placed centrally on the lower back, for mobile and / or key is how it has in recent years with many running clothes, well found.
CONCLUSION:
A functional part whose material pleasant support when running and where one does not sweat. It's easy to clean and high quality. But necessarily a buying one size bigger.
4 stars!