Polyester fibers are more breathable than nylon and offer better moisture-wicking properties. They allow air to circulate and moisture to evaporate, providing a comfortable wearing experience, especially in active or warm environments. Polyester is often blended with other fibers to enhance breathability and comfort.

Nylon is known for its breathability, allowing air to circulate and prevent overheating. This makes it a great choice for activewear and outdoor clothing. On the other hand, polyester is not as breathable as nylon, but it does have moisture-wicking properties which can help keep you dry and comfortable during physical activities.

Nylon: Generally less breathable than polyester, which can sometimes lead to discomfort in hot environments or during intense physical activities. Polyester: More breathable and often used in moisture-wicking fabrics designed to keep the wearer dry and comfortable.

Polyester is considered more breathable, somewhat more durable, and will last longer in the sun compared to nylon. However, polyester is also colder to wear compared to nylon of the same thickness.