How to Choose the Best Thermal Underwear

The winter is coming, do you prepare a set of thermal underwear for yourself? It’s time to choose a right thermal underwear.

If you want to put together the ultimate layering system, then start by focusing on the foundation of that system—your underwear (aka “base layer”). Comfort in the outdoors starts with the layer that touches your skin.

You have three key considerations in choosing a base layer:

Material matters: Fabric is your most important decision. Whether you go with a synthetic or a natural one, you need it to wick well (move sweat off your skin).

Weighty decisions: It’s pretty much “lightweight,” “midweight” or “heavyweight,” with thicker fabrics laying down a little extra warmth.

Fit factors: A wicking fabric has to be in direct contact with your skin to do its job, so you want a snug fit.

Synthetics

One of the most common synthetic fabrics for long underwear is polyester. You might also see nylon, polypropylene or rayon, or a blend of fabrics. Fabrics that include spandex offer comfortable stretch and can fit snugly without feeling constrictive. Synthetics have the following characteristics:

Super dry: Synthetics excel at wicking and dissipating sweat, so they give you the driest feel of any type of fabric.

Durable: No base layer is invincible; if you’re looking for your most durable option, though, then synthetics are your best bet.

Odor retention: Some synthetics add a finish that inhibits the buildup of odor-causing bacteria, which helps. If you’ll be going multiple days between washes, it helps to have some tolerance for stinkiness.

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