Why Do Running Shorts Have Underwear In Them

As a runner, I have always wondered why running shorts have built-in underwear. I mean, isn’t it enough to wear regular underwear under our shorts? After doing some research and talking to fellow runners, I have come to understand the importance and benefits of having underwear in running shorts. So, let’s dive into the world of running shorts and uncover the reasons behind this design choice.

The Importance of Support

One of the main reasons why running shorts have built-in underwear is for added support. When we run, our bodies experience a lot of movement, and the last thing we want is to feel uncomfortable or have any sort of distractions. The built-in underwear provides an extra layer of support for both men and women, keeping everything in place and minimizing any unwanted bouncing or chafing.

Moreover, the fabric used in the built-in underwear is often designed to provide moisture-wicking properties. This helps to keep us dry and comfortable by quickly absorbing and evaporating sweat, preventing any potential discomfort or irritation.

Chafing Prevention

Chafing is the enemy of every runner. The continuous rubbing of skin against fabric or skin can lead to painful blisters and sores, making our runs unbearable. The purpose of the built-in underwear is to act as a barrier between our skin and the shorts, reducing the friction that causes chafing.

By having the underwear integrated into the shorts, there are no extra seams or layers of fabric to rub against our skin. This can make a huge difference, especially during longer runs or in hot and humid conditions.

Freedom of Movement

Another advantage of built-in underwear is the freedom of movement it provides. Traditional underwear can sometimes restrict our range of motion, especially during activities as dynamic as running. With built-in underwear, designed specifically for the movement of running, we can enjoy a full range of motion without any hindrance.

Less Laundry, More Convenience

Let’s face it, nobody enjoys doing laundry. Having built-in underwear in our running shorts means one less item to wash and keep track of. It’s a convenient option for those who like to simplify their lives and spend more time on their runs rather than dealing with piles of laundry.


After diving deep into the world of running shorts with built-in underwear, I’ve come to appreciate this design choice. The support, chafing prevention, freedom of movement, and convenience it provides are all significant factors that enhance our running experience. So, the next time you put on a pair of running shorts with built-in underwear, know that it’s not just a fashion statement, but a practical and beneficial feature designed with runners in mind.