This was not what I expected and I've had quality issues with this top. Fabric is unusual, very fine weave polyester.  It's almost like that of a pair of women's tights and it behaves like it.  It's thin, slick (like silk), and runs/snags easily.  I've worn these only a few times and there are already multiple snags and runs in the fabric. I don't like the feeling of the silky fabric on the skin but this is subjective (I'm not partial to silk either).  They are light and seem fairly warm for the weight.  Mostly because of the easy-damage, I wouldn't buy these again at any price and they're not cheap.