Compression shorts are designed to fit snugly against your skin, like a second layer, and they work best when worn directly without underwear underneath. Getting the most out of them comes down to choosing the right size, knowing when to wear them, and taking care of the fabric so it holds its compression over time.
Skip the Underwear
Compression shorts are built to sit directly against your skin. Adding underwear underneath creates extra seams and bunched fabric that cause the very chafing compression shorts are supposed to prevent. The snug fit is also part of how they function: they need full contact with your muscles to reduce vibration and provide support. A layer of boxers or briefs between your skin and the shorts disrupts that contact.
Most compression shorts use moisture-wicking fabrics that pull sweat away from your body, and flatlock or flat seams that lie smooth against your skin instead of creating raised ridges. These features replace what underwear would normally do. If the shorts fit properly, you should feel snug and secure without anything underneath.
That said, some people prefer wearing lightweight, seamless underwear for personal comfort. If you go that route, choose a thin, moisture-wicking pair rather than cotton, which traps moisture and increases friction.
Getting the Right Size
Compression shorts should feel tight when you first put them on. That’s the point. Loose-fitting shorts won’t apply enough pressure to your muscles and won’t deliver any real benefit. Choose your regular size and expect the initial snugness to ease slightly as the fabric conforms to your body shape over the first few minutes of wearing them.
There’s a difference between snug and painful. If the shorts dig into your waist, pinch at the leg openings, or leave deep red marks after you take them off, they’re too small. Fabric that bunches up, particularly behind the knees or at the top of the thigh, can create concentrated pressure points that restrict blood flow. When you’re standing and moving, the material should sit flat everywhere with no rolling or folding.
Men’s and women’s compression shorts are cut differently. Men’s styles have a boxier waist-to-hip ratio and more room in the crotch. Women’s styles allow more room through the hips relative to the waist and often feature a wider waistband. Buying the version designed for your body makes a noticeable difference in how the shorts sit and stay in place during movement.
When to Wear Them During Exercise
Compression shorts reduce how much your muscles bounce and vibrate with each stride or jump. Research published in the National Library of Medicine found that compression garments significantly reduced soft tissue vibration and muscle displacement during running across multiple speeds. This matters because your body normally activates additional muscle fibers just to dampen that vibration, which costs energy and contributes to fatigue. With compression doing some of that work mechanically, your muscles can focus on the movement itself.
This makes compression shorts particularly useful for high-impact activities: running, jumping, court sports, and plyometric training. They also help during heavy lifting by supporting the muscles around your hips and thighs. For low-impact activities like yoga or walking, the benefits are less pronounced, though some people still prefer the feel.
If you’re wearing compression shorts under looser outer shorts, make sure the compression layer is long enough that the two hems don’t overlap at the same spot on your thigh. Seams stacking on top of each other in the same place can create a friction point during repetitive movement.
Wearing Them After Exercise for Recovery
Keeping compression shorts on after your workout can speed recovery. A meta-analysis of compression garment studies found a moderate, statistically significant reduction in delayed-onset muscle soreness (the deep ache you feel a day or two after hard training). The benefits were especially strong for strength recovery after resistance exercise.
Timing matters. The research showed the largest recovery benefits during two windows: 2 to 8 hours post-exercise, and again at the 24-hour mark. For strength recovery specifically, wearing compression for more than 24 hours after a hard session produced the biggest effects. If you’ve done a particularly intense leg workout or a long run, wearing your compression shorts for the rest of the day and even sleeping in them is a reasonable strategy.
For cyclists, wearing compression after a ride showed meaningful performance benefits at the 24-hour mark, suggesting they’re worth keeping on the evening before a back-to-back training day or stage race.
Washing and Maintaining the Fabric
The elastic fibers that create compression are surprisingly easy to damage. A few care habits will keep your shorts performing for much longer.
- Never use fabric softener or bleach. Both break down the elastic fibers that provide compression. Fabric softener coats the fibers with a waxy residue that also ruins moisture-wicking ability.
- Wash in cool or lukewarm water. Heat degrades elastic material. If machine washing, use a gentle cycle.
- Don’t wring them out. Twisting and wringing stretches the fabric permanently. After washing, press the shorts between a folded towel to remove excess water.
- Air dry flat, out of direct sunlight. Skip the dryer entirely. The heat accelerates elastic breakdown. Sunlight can also cause fading and weaken the fabric over time.
If you train frequently, rotating between two or three pairs lets each one fully dry and recover its shape between wears. Compression garments that have lost their snugness aren’t providing meaningful compression anymore, no matter how comfortable they still feel.