Running tights are often used to provide support and ventilation during exercise. Usually made with synthetic materials such as nylon or polyester, running tights are stretchy and flexible enough to contour the body. A number of options for garments to wear under running tights are available to provide further comfort and breathability.
Polypropylene is a type of polymer that absorbs water and transfers body perspiration away from the skin. This is often used in exercise apparel such as performance underwear, which can be worn under running tights to prevent sweat build-up. Although this material dries quickly, the sweat is expelled onto the outer layers of the garment and wind may cause the runner to feel cold. It is best to wear this fabric during hot or humid conditions.
Merino wool offers body temperature control and also repels moisture from the skin. However, unlike polypropylene, merino wool provides a more gradual cooling period and creates more warmth. Garments containing this material are best worn under running tights in cooler conditions.
Silk also keeps sweat away from the skin, though it lacks the fast drying ability that polypropylene and merino wool has. Under garments containing treated silk are best used for very cold weather because it retains heat while offering insulation.
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