Polyester, a synthetic fiber, differs from natural fibers like cotton and wool in terms of comfort and breathability. Here's a comparison of these factors:

Comfort:

Polyester: Polyester is often considered less comfortable compared to natural fibers. It has a smooth, somewhat slippery texture, and it may not feel as soft or pleasant against the skin. Some people find it less comfortable for extended wear, especially in hot or humid conditions.

Cotton: Cotton is highly regarded for its comfort. It is soft, breathable, and has a natural feel against the skin. Cotton fabric is gentle and comfortable to wear, making it a popular choice for casual clothing, underwear, and sleepwear.

Wool: Wool, when processed into fine and Polyester Fabric, can be very comfortable to wear. Merino wool, for example, is known for its softness and comfort. Wool has natural insulating properties, so it can keep you warm in cold weather, but it may not be as comfortable in hot weather.

Breathability:

Polyester: Polyester is less breathable compared to natural fibers. It does not allow for efficient air circulation and moisture wicking. As a result, it may trap heat and moisture, leading to discomfort, especially in hot and humid conditions.

Cotton: Cotton is highly breathable. It has good moisture-wicking properties, allowing sweat to evaporate from the skin and helping to keep you cool and dry. Cotton is an excellent choice for warm weather clothing.

Wool: The breathability of wool can vary depending on the thickness and weave of the fabric. Fine wool, like Merino, can be quite breathable and moisture-wicking. Wool has the unique ability to regulate body temperature by trapping warm air in cold conditions and allowing moisture to evaporate in hot conditions.

In summary, natural fibers like cotton and wool are often preferred for comfort and breathability. Cotton is highly comfortable and breathable, making it suitable for warm and hot weather. Wool, when processed properly, can also be comfortable and breathable but is better suited for cooler conditions. Polyester, while durable and easy to care for, may not be as comfortable or breathable, making it less ideal for activities or environments where these factors are important. However, advances in fabric technology have led to the development of "moisture-wicking" and "breathable" polyester blends that aim to improve its performance in these areas.