What type of fabric is best for underwear?

When it comes to the underwear fabric, it's better to choose natural fabrics for its comfortability.

The options can be cotton fabric, bamboo fabric, modal fabric, seaweed fabric. 

Cotton fabric is the most common fabric in our daily life.

Bamboo fabric and modal fabric are more breathable and moisture wicking than cotton fabric. 

Seaweed fabric has the best performance in anti microbial and fungus. It's also very soft and skin care. But its cost is much higher than bamboo fabric and modal fabric.