JMR Men's Heavy Weight Long Sleeve Waffle Thermal Shirt Crew Neck Top Underwear, Colors, SizesKhaki, Small

Long, warm, waffle knit, thermal I got it for sleep and hanging out around the house in winter with no pants LOL so it's perfect. Heavy cotton blend so it's perfect for outdoors, still fairly thin so it's great for layering. Extremely warm but not what I'd call heavyweight. Too warm to sleep in if the room is comfortable so that gives you an idea of how warm it is. I wish I could speak to size but I'm 5'1" and got a 3x so it would be super baggy and long. It comes almost to my knees and I roll up the sleeves. I hate anything close around my neck and the crew neck is open, loose and a bit stretchy so it works great for me. If you're a big dude get it! Lots of "give" so it gets comfy really fast! Great for camping or working outdoors.