Do Marathon Runners Wear Underwear

If you’re in a hurry, here’s what you need to know:

  1. Marathon runners do wear underwear. It’s often built into their shorts.
  2. The underwear must help reduce chafing, be comfortable, be sweat-wicking and offer support.

Shorts with built-in underwear

Most running shorts have liner underwear sewn into them so that you can avoid wearing a separate pair of underwear while still getting the benefits underwear provides.

The liner inside a pair of running shorts is usually made with a soft and comfortable material designed for fast movement and to wick away sweat. This can be very convenient, especially on hot days or when trying to pack light for a race or run.

However, some runners prefer to wear a separate pair of underwear underneath their running shorts for extra protection and support.

Ultimately, it is up to the runner to decide what feels most comfortable and provides the best support during their run.

Do Marathon Runners Wear Underwear

Running Shorts That Do Not Have Underwear Built-In

Loose-fitting running shorts that do not have underwear built in can still be worn with underwear.

However, they make it possible to choose the type of underwear paired with them. This offers a few advantages.

First, it allows you to choose based on the level of compression you want.

Second, it allows you to select materials that wick away sweat more effectively.

Third, it gives you options for colors and patterns that may be more flattering than those built into the shorts.

Ultimately, loose-fitting running shorts without built-in underwear provide more options when selecting the right pair for your run.

What function should running underwear provide?

Perhaps one of the most critical but often overlooked items of clothing for runners is their underwear. Running underwear needs to provide several essential functions to be effective.


Chafing is a massive pain during runs, both literally and figuratively. When your skin rubs against the fabric for an extended period, it can cause redness, irritation, and even blistering. To prevent this from happening, choosing a pair of running underwear that will minimize friction is essential.

Look for underwear made from smooth fabrics and ensure a snug, but not tight, fit. Additionally, look for underwear with flat seams to reduce the risk of chafing. With the right pair of running underwear, you’ll be able to focus on your mileage instead of discomfort.


Comfort is critical when it comes to running underwear. You want a pair that will stay in place and not ride up, chafe, or otherwise cause discomfort. Look for a pair made from a moisture-wicking fabric that will help keep you cool and dry.

Running underwear should be snug but not too tight and have a comfortable waistband that won’t dig in. Above all, could you make sure you choose a pair you feel good about wearing – after all, you’ll spend a lot of time in them!

Sweat Wicking

Sweat-wicking is an essential function of running underwear. When you are out on a run, you want to be focused on your breathing and your form, not on how sweaty you are.

Sweat-wicking underwear helps to keep you dry and comfortable by drawing moisture away from your skin and into the fabric, where it can evaporate quickly. This can help prevent chafing and keep you cool and refreshed, even on the longest and hottest runs.

In addition, sweat-wicking fabrics can also help regulate body temperature, keeping you warm and cool in cold weather. So, if you are looking for the perfect pair of running undies, look for ones with sweat-wicking capabilities.

Supportive (Men Only?)

Finding the right pair of running underwear can make all the difference in a successful workout for both men and women. In addition to being comfortable, running underwear should provide the proper support. This means finding a pair that fits snugly without being too tight for men. Additionally, the fabric should be breathable to help prevent chafing.

Support is also crucial for women, but many runners prefer underwear with a higher waistband to help prevent uncomfortable rubbing. Additionally, many women prefer running underwear with built-in padding for extra protection from impact. Ultimately, the best running underwear is the pair that provides the right mix of comfort and support for each runner.

By keeping these essential functions in mind, runners can ensure that they choose the best possible underwear for their needs.

Unwanted Reactions To The Materials Used

If you find that you have an unwanted reaction to the materials used in your running shorts, don’t despair.

There are several other options available that can provide the same level of comfort and performance. Bamboo, for instance, is a naturally antibacterial fabric that is also highly breathable. It’s also Eco-friendly and naturally soft, making it an excellent choice for sensitive skin.

Alternatively, you could try a pair of shorts made with technical fabrics such as polyester or nylon. These fabrics stretch, wick away sweat, dry quickly, and work to keep you dry and chafe-free. With so many options available, there’s no need to suffer from uncomfortable material reactions when you hit the pavement.

Train In Your Race Kit

Rule number one for race day is don’t race in any un-tested kit!

This rule applies to your short underwear combination as well. You want to ensure you are comfortable and won’t have any wardrobe malfunctions during the race.

The last thing you want is to adjust your shorts or have them fall during the race. You also want to make sure that your shorts do not chafe.

Race day is not the day to experiment with new clothing. Please be sure to stick with what you know works for you. This rule applies to your shoes as well. Could you make sure you have race-tested your shoes and that they are comfortable? You don’t want to deal with blisters or sore feet during the race. Follow these simple rules and have a great race day experience.

Final Thoughts

Most marathon runners wear some type of underwear, even though it may not be visible.

This is because underwear provides several important benefits that are essential for long-distance running.

First, it helps to reduce chafing by creating a barrier between the skin and the fabric of the shorts. Second, it helps to wick away sweat, keeping the runner’s skin dry and preventing uncomfortable rubbing.

Third, it can offer support for the muscles and helps to prevent injuries. For these reasons, marathon runners generally prefer to wear underwear that is specifically designed for running.



Slightly obsessed middle aged runner.