Why Do Running Shorts Have Built in Underwear? (Benefits of Liners) (2024)

A key feature of a good pair of running shorts is the ability to keep you cool. Staying cool is crucial for a successful run; thus, you will want a pair of running shorts accommodating to this fact.

The reason for running shorts having built-in underwear is actually quite simple!

Underwear is built into most pairs of running shorts because it helps the wearer to keep cool as they head out and exercise.

The fabric used to make the underwear into running shorts is designed to be light and breathable. It will quickly absorb sweat that builds up on your legs as you run.

Why Does Fabric Matter With Running Shorts?

Keep You Cool

A pair of running shorts is perhaps one of the key elements of a good outfit when heading out for a run.

They not only help to keep you comfortable and nice and cool as you head out, but they can also help you to look good as you head out on your run!

The design of the fabric, in turn, helps to make the shorts much cooler as the fabric allows air to easily flow through, helping to keep your legs cool, and to keep sweat from building up on them.

Prevents Chafing

The fabric also wicks away the sweat that builds up on the legs, which in turn helps to keep the legs from chafing as you run, allowing you to go much further!

As well as this, lined running shorts also help you to avoid that highly awkward situation when your running shorts inevitably begin to ride up your butt!

Only the lining of the shorts has the potential to ride, which helps to keep you from looking particularly silly while out for a run in public!

Do Running Shorts Need to Be Lined?

Why Do Running Shorts Have Built in Underwear? (Benefits of Liners) (1)

Running shorts do not need to be lined, but it is heavily beneficial to seek out running shorts that are lined with built-in underwear (most running shorts have liners).

The benefits that built-in underwear can offer are so multiple and so useful that it pays dividends to invest in a pair of shorts that has built-in underwear.

Do You Still Need to Wear Underwear When Wearing Lined Shorts?

No. Because of the fact that lined running shorts have underwear built-in, there is no need to wear any extra underwear underneath them.

However, there is no harm in wearing underwear with built-in running shorts if you so wish!

Wearing lined running shorts without underwear will still prove comfortable, because all sweat that builds up on your body will be easily wicked away. The breathable fabric will help you to feel even cooler than ever before!

What Can You Use Instead of Built-In Liners?

If you don’t want to wear running shorts that have built-in underwear in them, then there are a few things you can do to make your running experience more comfortable.

Wear Underwear

The best thing that you can do for yourself in such a situation is to wear some of your own undies underneath the shorts.

This can help to prevent chafing between your legs, which saves you from a lot of discomfort, and ensures that you are able to run for much longer.

However, you should be aware of the fact that most underwear will absorb your sweat. It is useful to a degree, as it helps to further prevent chafing. But that sweat will collect on your underwear over time, which can eventually cause even the underwear to chafe.

Suppose you’re going for a run wearing regular underwear under shorts. In that case, it’s probably best to avoid running the length of a marathon.

It is better to find chafe-free running underwear. It is especially vital for men.

Why Do Running Shorts Have Built in Underwear? (Benefits of Liners) (2)

Try Compression Shorts

Keep Your Legs Cool

You can also try purchasing compression shorts if you find the idea of built-in underwear in your shorts to be off-putting.

Compression shorts are designed to hug incredibly close to your legs, which helps to keep your legs cool, as the air can more easily reach your legs.

As well as this, the tightness of compression shorts also helps to prevent chafing from occurring on your legs in uncomfortable spots.

Massage Aching Muscles

The tightness of compression shorts also allows them to press on the muscles in your legs, which helps to massage them as you go, which can, in turn, help to up your endurance and allow you to go much further!

However, you should keep in mind that wearing underwear is not recommended when wearing compression shorts. The outline of the underwear will be incredibly apparent at a glance, and will also prevent the cooling effects of the shorts from working!

To Wrap Up

Most running shorts have built-in liners. Due to the lightweight construction of the lining, the shorts are more comfortable and cool.

The underwear that is built into running shorts is also able to easily absorb sweat that builds up when you run, which in turn helps to prevent chafing.

These benefits help to make built-in liners a no-brainer for runners of all types.

However, suppose you do not like running shorts with built-in underwear? Then you can always cut the liner off, all it takes is scissors. Or you can try to find linerless running shorts that don’t have built-in underwear (but they are rare).

Why Do Running Shorts Have Built in Underwear? (Benefits of Liners) (2024)

FAQs

Why Do Running Shorts Have Built in Underwear? (Benefits of Liners)? ›

Common Questions About Gym Shorts Liners

Are you supposed to wear underwear with running shorts that have a liner? ›

The short answer (no pun intended) is no. But it all comes down to personal preferences and comfort. Most top brands offer shorts that feature built-in liners, which do not require an added layer of underwear. The brief or boxer-brief liner is designed to provide support and coverage.

What are the benefits of shorts with liners? ›

The liner wicks away sweat from your body, keeping you dry and comfortable during your run. This is essential for preventing chafing and irritation. In other words, liners offering moisture management will help you run more comfortably for longer.

Why do running shorts have mesh liners? ›

Lined running shorts are made for running. Liners have a specialized fit and construction, with an emphasis on wicking, and often have anti-odor treatments as well.

Should I cut the liner out of running shorts? ›

Therefore, we argue that it is extremely likely, almost guaranteed, that underwear you already own and run in will perform better than the built-in liners that happen to come with your running shorts. Cutting out the liners and using your Goldilocks underwear will improve your running experience and performance.

Are lined or unlined shorts better? ›

Unlined shorts are generally more versatile since they can be worn for all types of workouts, for swimwear, or just casual daily wear. With lined shorts you are immediately prepared for any high intensity workout or long-distance run. Also, if you're traveling or doing laundry you have just one garment to worry about.

What do female runners wear as underwear? ›

The Best Running Underwear for Women
  • Best Overall: Tracksmith Brighton Briefs.
  • Best Value: Reebok Seamless Hipster Briefs.
  • Best Quick-Drying: Bombas No Show Hipster Underwear.
  • Best Breathable: Balanced Tech Hipster Brief Bikini Panties.
  • Best Odor-Resistant: Branwyn Essential Hipster.
Apr 15, 2024

Why do womens workout shorts have liners? ›

Roughly speaking, some shorts include liners to serve three primary goals: Reduce moisture buildup on the thighs and groin. Provide added support. Prevent chafing and irritation.

What do linerless shorts mean? ›

The clear distinction between the two types of shorts is that the lined variety have an interior layer, similar to a pair of compressive boxer briefs, that snugs around your legs. Unlined shorts, as the name suggests, don't.

Do lululemon shorts have liners? ›

We build our shorts based on activity, and give you the choice of length and liner.

What do runners wear under their shorts? ›

There is no liner or inner compression garment built into the shorts. Typically, you should wear underwear when running in athletic shorts that do not have a liner. Your underwear will provide the coverage and support you need as you run.

Why do runners wear tights under shorts? ›

Running tights are becoming an increasingly common kind of running apparel for both men and women. They offer several key benefits - including comfort, warmth in winter and muscle compression qualities which may improve results from your workouts.

What is the little pocket in running shorts for? ›

Many of our picks have a phone pocket on the liner of the shorts because this offers compression to keep the phone in place. Slash pockets, the slightly angled ones you put your hands in at the waist, are big enough for phones but don't hold them in place while you jog or squat.

Should running shorts be loose or tight? ›

For Running Shorts:

Choose shorts that offer enough room for unrestricted movement. They shouldn't be too tight around the waist or thighs. Consider shorts with a built-in brief for additional support. Look for shorts made of lightweight, breathable fabric to keep you cool during your run.

Can you swim in lined running shorts? ›

Yes, and I have. I have some lined Nike side split running shorts that I bought just for that purpose. They DO work as a swimsuit but are my least favorite choice for swimming. I find it far better to wear something smaller and made specifically for swimming.

How do you know if running shorts are too small? ›

With your shorts on, ensure that there is no more than an inch and a half of extra length in the crotch. Next, lift one leg up to hip level, and see how they feel. If your shorts feel tight across the top of your thigh or across your butt, you will want to try a larger size or a different style of shorts.

Do you wear underwear under bike liner shorts? ›

The chamois inside of your shorts was made to fit next to your skin to prevent chafing, and it's built from fabrics that wick moisture and dry quickly. Wearing underwear under your bike shorts adds seams that chafe and fabric that holds in moisture, so your best bet is to go commando when you're in the saddle.

Do you wear underwear with lined swim shorts? ›

The way we see it, the quick-and-easy answer to that question is an emphatic no. If you're wearing underwear under swim shorts, then you're wearing the wrong swim shorts. Because if swim trunks are made right – with an integrated liner and a support pouch that keeps your balls in place – you don't need the extra layer.

Do you wear underwear under compression liner? ›

Compression garments need to be on skin. That means "going commando" and not wearing underwear.

Do you wear underwear with lined shorts lulu? ›

A good liner hugs without binding up while wicking moisture away from your skin to keep you cool and comfortable as you work out. At the same time, lined shorts free you from having to wear underwear, since that inner layer serves as a pair of tight briefs.

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