Can You Wear Muay Thai Shorts During BJJ Training?

If you train both Muay Thai and Brazilian Jiu-Jitsu, at some point you've probably grabbed the same pair of shorts for both sessions without thinking twice. It makes sense on the surface. Muay Thai shorts are comfortable, they're already in your bag, and buying separate gear for every discipline feels excessive. But once you actually roll in them, things start to go sideways fast.

The short answer is that Muay Thai shorts technically work, but they weren't built for grappling, and the differences show up the moment someone starts pulling on your legs. Below, we'll go through exactly what separates the two, where Muay Thai shorts fall short on the mats, and what to wear instead if you're serious about your no-gi training.

What Makes Muay Thai Shorts Different From BJJ Shorts

Muay Thai shorts use a loose, wide leg cut with side slits and a slick satin style fabric designed for unrestricted kicking. BJJ shorts use a snug, compression adjacent fit with flat seams and grip friendly fabric built to withstand constant pulling, gripping, and friction on the mat.

Material and Cut

The satin or silk blend material in most Muay Thai shorts exists for one reason: it's slick and lightweight, which lets a fighter throw high kicks without fabric dragging against the leg. That same slickness becomes a liability in BJJ, where your opponent is actively trying to grip your legs, control your hips, and pass your guard. A slippery short works against you and, honestly, works in your training partner's favor.

The wide side slits are another feature built specifically for striking. They give a Muay Thai fighter room to throw a head high kick without the fabric bunching. On the ground, those same slits open up during hip escapes, guard passes, and scrambles, exposing more leg than most BJJ gyms are comfortable with.

Why Muay Thai Fighters Need That Design

None of this means Muay Thai shorts are poorly made. They're built exactly right for their sport. Striking demands a full range of hip and leg motion, and a light, slick, breathable fabric supports that perfectly. The mismatch only appears once that same design gets carried over to a completely different physical demand.

Can You Actually Train BJJ in Muay Thai Shorts?

You can technically roll in Muay Thai shorts, but most grapplers who try it switch back to dedicated BJJ shorts within a session or two, because the fit and fabric actively work against common grappling positions like guard retention and hip control.

If you compete, this becomes less of a preference and more of a rule. Most no-gi tournament rulesets require snug fitting grappling shorts or compression shorts rather than the loose, slitted style used in Muay Thai. Even outside competition, plenty of gyms will politely point you toward proper shorts once fabric starts sliding around during live rounds.

BJJ Shorts vs Muay Thai Shorts at a Glance

The table above sums up most of the practical differences, but the biggest one comes down to grip. BJJ is a game of friction and control, and a fabric built to slide isn't going to help you hold position.

Problems You'll Run Into on the Mats

•         Shorts ride up during scrambles, especially in closed guard and during mount escapes

•         Slick fabric reduces hip pressure and control in top position

•         Wide side slits expose more skin than most academies consider appropriate

•         The elastic waistband stretches out fast under constant gripping and pulling

•         No natural pairing with a compression rash guard, so you lose the layering benefit that keeps gear in place

None of these issues will ruin a single casual roll. But if you're training BJJ several times a week, they turn into a recurring distraction, and eventually a gear upgrade you probably should have made sooner.

What to Wear Instead for No-Gi BJJ

If no-gi is a regular part of your training, the fix is straightforward. Look for shorts built specifically for grappling: a snug fit through the hip and thigh, a flat non-slip waistband, and reinforced stitching along the inseam, since that area takes constant stress in BJJ.

Our BJJ shorts collection is built around exactly those requirements, with fabric designed to stay in place through hip escapes, sweeps, and long positional sparring rounds. If you want something with more character and the construction quality Shoyoroll is known for, our Shoyoroll shorts collection brings that same premium approach over to grappling shorts.

Pair your shorts with an actual compression rash guard instead of a loose t-shirt. The combination keeps everything locked in place, reduces mat burn, and gives you one less thing to think about mid-roll. Our BJJ rash guards collection carries multiple cuts and thicknesses depending on how warm your gym runs.

If you're building a full no-gi kit from the ground up, our no-gi BJJ collection brings shorts, rash guards, and other essentials together in one place, which is a faster way to outfit yourself than shopping piece by piece.

When Muay Thai Shorts Are Actually Fine

There are a few low stakes situations where none of this matters much. Light technical drilling without live rolling, a quick warmup before class, or solo training at home are all fine in whatever shorts happen to be clean that day. The problems above really only show up once you're doing live, resistance based grappling where grip and fabric behavior actually come into play.

Frequently Asked Questions

Can I wear boxing shorts for BJJ instead?

Boxing shorts run into the same problem as Muay Thai shorts. They're built for a striking sport, so the fabric is loose and slick instead of compression fit, which makes them a poor match for the demands of grappling.

Do gyms actually enforce what shorts you wear?

Most gyms aren't strict about it for casual open mat, but instructors will usually steer you toward dedicated grappling shorts once fabric starts riding up or slipping during live rounds. It's less a hard rule and more a matter of what holds up.

What's the real difference between BJJ shorts and regular athletic shorts?

BJJ shorts use a snug, four way stretch fabric with reinforced seams built for constant pulling and friction. Regular athletic shorts, like running or basketball shorts, are made for a different kind of movement entirely and won't hold up the same way under grappling specific stress.

Are Muay Thai shorts allowed in no-gi competition?

Most no-gi rulesets require fitted grappling or compression shorts rather than loose, slitted shorts, so Muay Thai shorts are typically not tournament legal even if a gym allows them for casual training.

Final Thoughts

Muay Thai shorts have their place, just not on the BJJ mats. If no-gi training is a regular part of your week, investing in shorts actually built for grappling will save you the mid-roll adjustments and give your training partners one less thing to comment on. Browse the full BJJ shorts collection, or check out everything Cosmeio BJJ carries on our home page to find the right setup for your training.