Don’t let winter’s cold temperatures prevent you from enjoyingtime outside.
When you’re indoors watching a movie, thermals can serve as comfortable loungewear, too.
According toRolling Stone, thermal underwear are so great because of their minimalistic look.

Avoid tight thermals that rub or irritate your skin and make it harder to move your body.
If warmth is your top priority, one material may stand above the rest.
Merino wool is also a sustainable choice.

One sheep produces 4 to 5 pounds of wool annually, making the fiber a natural, renewable resource.
Additionally, wool biodegrades after a year in the ground, making it even more environmentally friendly.
Rolling Stonecalls merino wool “the gold standard” for thermal underwear.
If you want something lighter but still warm, the outlet suggestsRidge Aspect’s Midnight Merino Wool Base Layers.
Plus, they can be worn alone or layered.