Amazon EssentialsTech Stretch Mens Muscle Shirt

Can I heat transfer on to this meteral

this shirt does not have an SPF rating. is anyone getting sunburn wearing it?

I’m 5’8 and 195 pounds, which size would fit for me, M or L?

How big are the arm holes - most workout shirts have large armholes which I don't like? Hard to find them with normal armholes.