The fabric of this shirt is an unusual synthetic blend that captures and increases the warmth.. I wore this in the mid 80's and the sun on my back in that black shirt seemed mid 90's.To be honest it looked like one of those old plastic Halloween costumes we do everyone wore as kids.I wasn't expecting much at this price point but considering the decent dry fit training shirts you can get in this price range I was surprised at how cheap the fabric is on this collared shirt.The design is but cool, which is why I give more than one star.