Review on Columbia Heavyweight Stretch Sleeve Underwear by Jonathan King

This shirt is a lightweight base layer with a splash of space thermal reflective plastic. The plastic points are certainly not a comfort factor, but not uncomfortable in and of themselves, although I found them too uncomfortable for me, but I'm sensitive. the patches appear to reflect heat, but unlike the fleece lining, do not retain it. so you never get warm in it, just not cold. This can be a plus if you like rock climbing or trekking but aren't very keen on sitting still or at home.