It's very tight because has too much elastine. you have to choose bigger size than you use.
A good running baselayer
Can't say I notice much muscle compression, but as a skin-tight baselayer (which is what I bought it for) it works fine. One limitation is that although it's very good at absorbing sweat it doesn't wick much of it away. Which isn't surprising or usually a problem since it keeps it off the skin, but in cold-ish weather the sweat trapped in the fabric eventually becomes cold water.
EXCELLENT SELLER AND GREAT PRICE, GREAT QUALITY GREAT FIT..AAAAA+++
Nice and tight
It's a really nice top but even for a compression fit it's very tight for a medium.