Duofold makes an exceptional double layered thermal undershirt with a crew cut neck for incredibly cold weather. I got this not too long ago; and this particular undershirt is probably the best one I have when I want to use it as a layer of clothing to protect myself from the cold. I am also extremely impressed that it was designed to help protect U.S. Special Forces--now you KNOW it's going to help you stay warm in cold weather! This can be worn as underwear under your outdoor clothes or you can wear it in bed with thermal pajamas on over it.

It does have odor resistant properties. Moreover, the fabric doesn't bunch up very much so it remains pretty comfortable while you're wearing it.

This will last years with the proper care. I put mine in the regular clothes washer and dryer and it comes out fine. Note that this only comes in black; if you're concerned about the black color "bleeding" onto other articles of clothing, wash this with garments that are not white. In addition, it shrinks very little.

If you want to order this here, check the pricing and availability chart and the merchant sizing chart before you order.

Overall, Duofold makes an awesome "expedition weight two-layer thermal tagless crew" neck styled undershirt. I highly recommend it for when the temperature drops and you need to stay warm!