Should you still wear normal underwear under Merino thermal underwear?

When wearing merino thermal underwear, you want to take advantage of the positive properties of merino wool. To name a few:

• It insulates well against cold and heat,
• transports moisture,
• can absorb up to a third of its weight in moisture without feeling damp and
• warms even when wet.

Why should I wear merino wool?

If you put on a cotton T-shirt as a base layer on your skin and merino thermal underwear on top, the properties that merino wool offers will be lost.

Here is an example: Everyone has to sweat during sport, as our body constantly tries to keep our body temperature at a healthy 37 degrees Celsius. The cotton T-shirt soaks up sweat and evaporative cooling occurs. As long as you continue to exercise and the body produces heat, everything is fine. But during a break, the body produces less heat and it cools down as the moisture continues to evaporate. Worn over a T-shirt, the merino wool garment and its properties cannot function as they are simply not utilised. The unique ability of merino functional underwear is that it can balance the body and its temperature like no other material can in such situation. It can cool the body during training and warm it up during breaks by absorbing heat.

For this reason, you should not wear normal underwear under merino thermal underwear, otherwise the positive properties of the wool, for which you are wearing the garment in the first place, will be lost. You can find out how to properly combine the different layers of clothing HERE .