compression style linings in running shorts

Why Do Running Shorts Have Underwear

Estimated read time: 4 minutes.

“Why do running shorts have underwear?” you might ask. It’s a valid question and one that many people wonder about. The answer is actually pretty simple: to provide comfort and support.

Running shorts are designed to be as lightweight and breathable as possible, and wearing underwear underneath them can help keep you comfortable while you run. Additionally, the built-in liner in running shorts helps prevent chafing and keeps you feeling dry.

The Benefits of Running Shorts With Built-in Underwear

The underwear inside running shorts is called linings and is usually made from lightweight, moisture-wicking fabric. This helps to keep you feeling dry and comfortable while you run.

Benefits of using running shorts with linings include:

  • Reduced chafing: Because the underwear is built into the shorts, there is less friction between your skin and the fabric. This can help to reduce chafing and irritation, especially on long runs.
  • Stay in place: Linings can help to keep your shorts in place, so you don’t have to worry about them riding up or slipping down.
  • Quick-drying: If you get caught in the rain or sweat a lot, the quick-drying fabric can help to keep you feeling comfortable.
  • You don’t need underwear: This might be the biggest benefit for some people. If you don’t like wearing underwear or find it uncomfortable, you don’t have to wear any with these shorts.
  • Offer support for men’s genitals: For men, the built-in underwear can provide support and help to keep everything in place.
  • Prevent women’s shorts from becoming see-through when wet: This is probably the most important benefit for women. No one wants their shorts to become see-through when they’re sweating or wet, and a lining can help to prevent that.

However, there are also a few potential disadvantages to consider:

  • More expensive: Running shorts with built-in underwear tend to be more costly than regular running shorts.
  • Might not be as comfortable: Some people find that the extra layer of fabric can be uncomfortable, especially in hot weather.

The Different Types of Built-in Underwear Available

There are two types of linings: Comfortable, lightweight brief-style linings that sit close to your skin and don’t move around much, and compression-style linings designed to hug your muscles and prevent chafing. Additionally, the shorts’ compression fabric can help reduce muscle fatigue and improve blood circulation.

compression style linings in running shorts v2
Running shorts with compression-style linings. 
lightweight linings in running shorts
Running shorts with lightweight brief-style linings.

How to Choose the Right Pair of Running Shorts for You

If you’re thinking about trying out running shorts with built-in underwear, there are a few things to keep in mind. First, make sure to choose a pair that fits well. You don’t want them to be too tight or too loose. Second, consider the fabric of the shorts. Look for something breathable and moisture-wicking. Make sure the waistband is comfortable and doesn’t dig into your skin.

While running shorts with built-in underwear are becoming popular, some people find that they have problems with the fit. For example, the shorts might ride up or be tight in certain areas. If this happens, you can try adjusting how you wear them. Another option is to buy a different style of running shorts that better suits your body type.

Once you’ve found the perfect pair of running shorts with built-in underwear, you’ll never go back to regular running shorts again!

Is It Okay to Cut off the Underwear on My Running Shorts?

We don’t recommend cutting off the underwear on your running shorts. The reason is that the fabric is there for a reason – to provide support, comfort, and protection. Additionally, if you cut off the underwear, you run the risk of the shorts becoming see-through when they get wet.

How to Care For Your Running Shorts

To make sure your running shorts last, it’s important to wash them after each use. However, don’t use fabric softener or put them in the dryer. Instead, hang them up to air dry. This will help to keep the fabric from breaking down over time. Additionally, avoid ironing or bleaching the shorts as this can also damage the fabric.


Running shorts with built-in underwear are becoming popular for runners, as they offer several benefits compared to regular running shorts. These benefits include reduced chafing, staying in place, quick-drying, and the prevention of women’s shorts from becoming see-through when wet.

Additionally, the fabric used for the linings is typically lightweight and breathable, making it more comfortable to wear for long periods. Although running shorts with built-in underwear are more expensive than regular running shorts, they are worth the investment for many runners.


Joseph Peele