Why Do Running Shorts Have Liners? (Explained!)

Last Updated on May 6, 2022 by Jim Kein Kein

Liners provide moisture-management to help keep things cool, comfortable and dry. Additionally, they are built to provide enough support and compression as well as comfort for men who don’t like wearing jocks – because who said you need a jock?

These days, more and more sports suppliers are coming out with a product that combines two of their items as one. Many running shorts now feature a sewn-in liner which is used to protect the sensitive skin on your legs from moisture and also to prevent chafing while running or bicycling in short cuffed trousers (shorts) because of how tightly they fit over our legs. This protection has been done since prior to the days when we wore underwear, but some people still run without it or think that the seams in their shorts create enough friction to avoid wearing anything underneath.

Why do they put liners in running shorts?

Why do they put liners in running shorts

Compression shorts are becoming increasingly popular as men’s and women’s underwear options. These briefs often have a lining on the inside to offer a bit of support and to prevent chafing of the genitals from the material. This lining is not necessary for running shorts, which can be used for more than just for sporting events like workout wear.

Are lined shorts good for running?

While not everyone wearing a pair is used to them, the reality is that runners who experience chafing or pain after too much strenuous exercise don’t want to continue. No one wants to come home with a sore behind and make money running around in underwear so liners are a critical aspect of experiencing less bouncing while running and becoming more successful.

Why Do Running Shorts Have Built-In Underwear?

Different fitness pants for men and women provide different functions to protect against chafing, especially during warm conditions. Some are designed with built in underwear and some do not include it. Having underwear sewn into the pants helps athletes move better even when just wearing the other apparel due to their lightweight nature while providing minimal but necessary coverage. Read more about Are You Supposed To Wear Underwear With Running Shorts

Five benefits of built-in underwear

Five benefits of built-in underwear

1. Wicks sweat and moisture away

The liners inside most running shorts are made with a moisture-wicking material to move moisture away from your thighs and crotch area. This fabric wicks the sweat away from your body so that you don’t feel clammy while you’re working out, which may be uncomfortable or cause chafing. Additionally, many pair of running shorts are designed in a way that allows maximum airflow through the legs or have side slit openings to allow runners to easily maneuver their legs as they often bend their knees during their workout.

For serious athletes and sports enthusiasts, technical workout clothing is a must. These fabrics are thinner and lighter than ordinary fabrics and create a wicking effect for heat to escape the body on days when it’s hot outside. The material breathes well, keeping your skin dry. When you wear this type of garment, you feel cool and refreshed after a challenging run or any other physical activity outdoors.

2. Offers support for men’s genitals

The reason running tights with a liner are so popular amongst athletes is due to the fact that they provide added security and storage. These tights were originally designed simply to hold what was needed for comfort in men, including the genital region and even small packages of tissues! Our bodies have become more well-equipped over time as we have evolved into becoming more athletic as our lifestyles demand it and we’re able to rely on things like exercise.

Looking for that comfortable pair of running shorts with a design that gives you confidence to hit your target distance? You can run comfortably knowing that it’s possible thanks to compression shorts with liners. These specially designed underwear for runners have lightweight materials used for the liners that are able to provide the right amount of support during long distance runs. There are different types of liner materials like spandex, nylon and viscose.

3. Prevent women’s shorts from riding up

While most women would prefer fleece lined shorts, they almost never have a chance to enjoy them as they need a roomy fit that wouldn’t show underwear lines. Fortunately, there’s a variety of athletic wear with built-in boxer briefs that are made of spandex and sweat-wicking fabric for enhanced comfort in any athletic activity. They are designed for both men and women, come mainly in red and black colors, but may also come in grey or blue. And comfortable lining ensures sweat doesn’t get out of the pants.

4. Prevents chafing

Wearing liners with your running shorts helps prevent chafing by keeping you comfortable. Chafing happens when there is a lot of rubbing over the skin from clothing moving around and pulling on it as you move. If the material on the fabric were to be held tightly against your body, it is unlikely that this kind of movement could happen.

Related Post: Is It Acceptable To Go Shopping With A Sports Bra And Shorts? (Explained!)

Frequently Asked Questions

Are you supposed to wear underwear with running shorts?

Each person’s experience with running clothes is different. When you are training it is good to experiment with the functions of your clothing, particularly when it comes to what you wear underneath your running shorts. You may feel more comfortable wearing underwear, but there are also strides made in textile engineering that minimize fabric-to-skin friction while providing ample ventilation and compression so using a liner is not absolutely necessary. Remember: It all comes down to what makes you most comfortable.

Can you cut the liner from running shorts?

The liner of shorts can be cut externally. Pull out the underwear that doesn’t match your skin color as a reference and make slices where they have been sewn.

Some of today’s running shorts actually have built-in underwear, and others come without any. For those with them, we find them to be convenient as they slip in neatly inside the shorts so you don’t have to buy another layer of underwear but if you find them uncomfortable then we recommend giving separate underwear a try because it has been known to offer more comfort.


We’ve come to the end of this informative article. We hope you were able to find good resources in your quest to know why running shorts have liners . If you have any questions or comments, don’t hesitate to contact us. Thanks!

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