Fitting your long underwear
When picking the best size for your long underwear, you need to keep in mind a couple of things. Your thermal set should be fitted, which means tight enough that there are no gaps between the fabric and your skin. This can allow cold air to creep in. However, thermal underwear shouldn’t necessarily be skin tight. You want your skin to be able to breathe, and allow water vapor to leave your body without being forced to settle again your skin, as this will make you cold fast. Keep in mind that your next layer of clothing should not be as snug, this gives those vapors somewhere to go.