Buzz
If you're someone who typically wears underwear with every outfit—perfectly normal, in my opinion—you might begin to question what's up with running shorts and activewear leggings. Some loose-fitting men's shorts feature a built-in liner, and certain women's designs have a crotch gusset made of a material different from the rest of the shorts. You might wonder, 'Am I really supposed to wear these without underwear?' In many cases, the answer is yes.
This topic comes up often. On Reddit, it’s a hot topic in the running forums, women’s fitness forums, and the 'no stupid questions' sub, among others. The discussions typically split into two camps: those who can’t imagine running without underwear and those who prefer to go without. Both groups are often astounded by the existence of the other.
So let’s break it down. Anyone can wear whatever shorts they want, in my opinion, but they’re usually marketed in ‘men’s’ and ‘women’s’ categories, so here’s what you might find in each section.
What to expect from men’s running shorts
Men’s running shorts frequently feature an underwear-like liner to 'keep everything in place,' as one helpful redditor put it. Why not simply wear standard underwear? You can, but running shorts are specifically crafted to be breathable and moisture-wicking, so using your regular cotton underwear could interfere with that design. Consider the liner as free, performance-focused underwear built for running.
The liner also serves to reduce chafing, as highlighted in this conversation among ultrarunners (athletes who tackle distances longer than a marathon). Styles vary, ranging from minimalist liners to full compression shorts. Tightly fitting running tights might include a windproof panel at the front, suggesting they're meant to be worn without underwear.
If your running shorts lack a liner, a typical recommendation is to pair them with compression shorts or consider returning them to purchase a pair that includes the liner.
What to expect from women’s running shorts
There’s less agreement on women’s shorts and leggings: some choose to wear underwear, while others prefer to skip it.
Generally, if your loose-fitting shorts have a tight-fitting liner, they are designed to be worn without underwear. Additionally, if there's a crotch gusset (a section of doubled-up fabric with a different texture right between your legs), that’s another indicator they’re meant to be worn commando.
Many runners opt to go commando and often notice less chafing around the waistband or thighs when they do. The combination of a shorts liner and underwear—especially when sweaty—can sometimes create an uncomfortable situation.
However, if you feel more at ease wearing underwear, it may prolong the life of your shorts (especially if you're concerned about stains) and could even allow you to wear them more than once without needing a wash. Consider investing in running-specific underwear, as some runners find merino, for instance, wicks sweat more effectively than other fabrics.
When dealing with regular leggings, rather than purpose-built running shorts, consider doing a 'squat check' to ensure they won’t become see-through when stretched. (Use a mirror, phone camera, or a trusted friend to help you out.) Also, try the leggings on without underwear before hitting the gym: some aren’t made for commando wear and might have seams in awkward spots.
