Which fiber is considered the warmest for clothing?

Wool is considered the warmest fiber for clothing primarily due to its unique properties. Wool fibers have a natural crimp that creates air pockets, which enhances insulation and retains heat more effectively than many other fibers. This insulating ability allows wool to trap body heat, keeping the wearer warm even in cold conditions. Additionally, wool has moisture-wicking properties, which means it can pull moisture away from the body while still maintaining warmth, making it an excellent choice for cold-weather garments.

Silk, while soft and luxurious, does not provide the same level of insulation as wool. Cotton is breathable and comfortable but lacks the thermal properties needed for warmth. Linen, known for its coolness and breathability, is primarily suited for warmer climates. Therefore, when it comes to warmth in clothing, wool stands out as the superior choice.