Why do running shorts have lining on the inside?

The lining found on the inside of running shorts serves multiple purposes and is commonly known as a brief or compression liner.

Here are some reasons why running shorts have this lining:

Moisture Management: The primary function of the lining is to help manage moisture and sweat. The liner is typically made of a moisture-wicking fabric that pulls sweat away from the body, keeping you dry and comfortable during your run. It helps to prevent the buildup of moisture, which can lead to chafing and discomfort.

Support and Stability: The liner provides support to the groin area and helps to keep everything in place while you’re running. It can help reduce excessive movement and bouncing, enhancing comfort and stability.

Chafing Prevention: The smooth fabric of the liner reduces friction between your thighs and prevents chafing. It acts as a barrier between your skin and the outer layer of the shorts, reducing the likelihood of irritation and rubbing.

Modesty and Coverage: The liner adds an extra layer of coverage, providing modesty and preventing any accidental exposure during physical activity. It ensures that you can move freely without feeling self-conscious.

Convenience: The liner eliminates the need for additional undergarments, as it functions as a built-in underwear. This simplifies your running attire and reduces the number of layers you need to wear.

It’s worth noting that not all running shorts have a lining. Some shorts, particularly those designed for professional athletes or individuals who prefer to wear their own compression shorts or undergarments, may not include a built-in liner. However, for many runners, the lining is a beneficial feature that enhances comfort, performance, and overall functionality.