1. Sports: generally produced by sporting goods and outdoor goods manufacturers, with various functions such as heating, ventilation, quick drying and waterproof as gimmicks, and many so-called "patented technologies", such as Gore-tex, cool-max, thermo-layer, dri-fit and so on, are countless. In fact, they are all floating clouds, and the fabric itself is polyester. The advantages are that the skin is not bloated, elastic, does not hinder exercise, and dries quickly. Disadvantages: the polyester package is uncomfortable, and the climate is dry and static.

2. Home style: mainly cotton, with bamboo charcoal fiber, wool, modal (as if made of wood), lycra (an artificial elastic fiber) and so on. The advantage of this series is that it is comfortable to wear, but the disadvantage is that the shape is poor, and it will go out of shape after washing several times.

Merino wool is a kind of wool fabric, which is very popular. Merino sheep is the breed name of sheep, and its wool quality is very good. The evaluation is high, but expensive. I haven't experienced it, so it's hard to evaluate. However, personally, it is not cost-effective, and pure wool is generally not suitable for close-fitting and uncomfortable.

I think underwear is close to the skin and must be comfortable. Everything else is secondary, so pure cotton must be the first choice and the price is cheap. If you wear out and don't like it, buy a new one.