How to Stop Underwear Riding Up Under Gym Shorts: A Fit Fix Guide

Quick Answer

Underwear riding up under gym shorts is almost always a fit or fabric problem, not a workout problem. Check the size first: too-large leg openings let fabric migrate as you move. Then check the cut: briefs with firm leg grip stay put, while loose or stretched waistbands and leg bands let fabric creep. Finally, check the fabric: soft, quick-dry blends move with you instead of bunching. Fix the size, then the cut, then the fabric, in that order.

You're mid-set, mid-sprint, or mid-squat, and your underwear has decided to become a wedgie. It's one of the most common underwear fit problems, and it has almost nothing to do with how much you paid for the shorts. Underwear riding up under gym shorts comes down to three things: size, cut, and fabric. Get those right and the problem mostly disappears.

This guide breaks the issue down by symptom, so you can diagnose what's actually happening instead of guessing. We'll cover the quick fixes you can try today, the cut and fabric choices that prevent bunching, and the point where you should stop adjusting and switch to a different style entirely.

Symptom: The Leg Openings Creep Up While You Move

If your briefs or trunks ride up specifically at the leg openings during squats, lunges, or running, the leg bands are probably too loose or have lost their grip. Fabric needs something to hold it in place; when the leg opening is slack, every step or rep gives it room to migrate upward. This is the most common cause of briefs riding up, and it's usually a size or wear issue rather than a design flaw.

Check the leg grip first. If the elastic feels stretched out or the fabric slides easily against itself, the brief has done its time. If it's new and still rides up, try one size down, or look for a cut with firmer leg grip built in. The Cotton Classic Brief - Fuchsia, for example, uses a reduced 3.5cm waistband and firmer leg grip specifically for more comfortable all-day wear, which also helps it stay put under shorts.

• Test leg grip: pinch the leg opening and pull gently. If it stretches easily and doesn't snap back, the elastic is worn.
• Try sizing down before switching styles. A snugger leg opening often solves the problem outright.
• Avoid fabric softener on underwear; it coats elastic and reduces grip over time.

Symptom: The Waistband Rolls or Slides Down

A waistband that rolls or slides is a different problem from leg creep, and it usually points to a waistband that's too wide, too soft, or simply the wrong size. Wider waistbands distribute pressure better but can roll if the fit is loose. Narrower waistbands stay flatter but need to sit snugly to do their job. If your waistband is moving, the underwear isn't anchored, and the rest of the garment will follow.

Look at waistband width and construction. A 3.5cm waistband, like the one on the Cotton Classic Brief, sits flatter than a wide band and is less prone to rolling. A 1cm waistband, like the one on the Glide Micro Thong - Glacier, is even more minimal but relies on a precise fit. If your waistband rolls, size down or switch to a narrower, firmer band.

• Measure your waist and compare it to the brand's size chart; don't assume your usual size carries over.
• Narrower waistbands roll less but need a closer fit to stay anchored.
• If the waistband rolls on a new pair, it's the wrong size or cut for your body, not a defect.

Symptom: Fabric Bunches Instead of Sliding

Sometimes the underwear isn't riding up so much as bunching in place. This happens when fabric is too thick, too absorbent, or has too much friction against your shorts. Heavy cotton feels great for lounging but can grab and bunch during sweaty movement. Quick-dry, smooth fabrics slide against shorts and against skin, which keeps everything where you put it.

The Icon Thong - Forest uses a soft, quick-dry fabrication designed to keep the fit cool, smooth, and comfortable, which is exactly the property that prevents bunching under gym shorts. The Glide Micro Thong - Glacier goes further with a super soft fabrication made from earth-loving recycled material and a minimal cut that feels like you're wearing nothing at all. If bunching is your main complaint, fabric is likely the culprit.

• Quick-dry, smooth fabrics bunch less than heavy cotton under shorts.
• If you sweat heavily, choose a fabric that wicks rather than absorbs.
• Two pairs of the same size can behave differently if the fabric blend differs.

Symptom: A Thong Rides Up More Than You Expected

A thong riding up during a gym session is often working as designed, just more than you want. The minimal back means there's less fabric to anchor the garment, so the fit has to be precise. If the waistband is loose or the pouch doesn't sit correctly, the whole thing shifts. The fix is usually a snugger waistband and a cut that keeps the pouch in place.

The Glide Micro Thong - Glacier combines a minimal thong cut with just the pouch and string attached to a 1cm waistband, plus super soft recycled fabrication, which keeps the fit close without digging in. If a thong still rides up after sizing down, it may simply not be the right style for high-movement training. That's a valid conclusion, not a failure.

• Size down before abandoning thongs; a snug waistband is what keeps a thong in place.
• If the pouch shifts during squats, the cut isn't matching your movement pattern.
• Thongs work well for lifting and casual gym wear; for high-impact cardio, a brief may be more stable.

Symptom: Sheer or Novelty Cuts Move More Than Solid Ones

Sheer inserts and fashion-forward cuts trade some stability for style. The Score Sheer Slim Brief - Boysenberry, for example, features a sheer skin-baring insert that curves over the top half of the back, creating a peek-a-boo effect. That design is intentionally less anchored than a full-coverage brief, so it may shift more during intense movement. That's a design tradeoff, not a defect.

If you love the look but want less movement, reserve sheer and novelty styles for lower-impact sessions or for wearing outside the gym. For heavy lifting or running, choose a cut with more coverage and firmer leg grip. Matching your underwear to the activity is the simplest fix of all.

• Sheer and peek-a-boo designs prioritize style over stability; that's expected.
• Wear novelty cuts for low-impact days and full-coverage briefs for training.
• If a style moves no matter what, it's the wrong tool for that workout.

When to Stop Adjusting and Switch Styles

There's a point where no amount of sizing, tucking, or adjusting will fix a pair of underwear for a given activity. If you've sized down, checked the leg grip, confirmed the fabric is smooth and quick-dry, and it still rides up, the cut simply doesn't match your body or your movement. Stop fighting it. Switch to a different style, or reserve that pair for non-gym wear.

The same logic applies to specialty pieces like the Strapped Sports Brief - Onyx, which is crafted from supple PU leather with a tone-on-tone cheetah print and designed to pair with the matching STRAPPED Harness and Tank. That's a statement piece for the right moment, not necessarily a high-sweat training brief. Knowing which pair is for which job is the real skill.

• If you've fixed size, cut, and fabric and it still rides up, change the style, not the brand.
• Keep one reliable training brief and save statement pieces for their intended use.
• Rotate your underwear so elastic has time to recover between wears.

Fit Diagnosis: Match the Symptom to the Fix

• Leg openings creep up: Likely cause: loose or worn leg elastic, or a size too large. Check the leg grip by pinching and releasing; if it doesn't snap back, the pair is worn out. If it's new, size down or choose a cut with firmer leg grip like the Cotton Classic Brief. Fix size first; if leg grip is gone, replace the pair.
• Waistband rolls or slides: Likely cause: waistband too wide, too soft, or the wrong size. A 3.5cm band sits flatter than a wide band. If it still rolls after sizing down, the cut isn't matching your torso. Narrower, firmer waistbands stay put better under shorts.
• Fabric bunches instead of sliding: Likely cause: heavy or absorbent fabric creating friction against shorts. Switch to quick-dry, smooth fabrics like those in the Icon Thong or Glide Micro Thong to reduce grab. If bunching persists, fabric is the problem, not the size.
• Thong rides up during training: Likely cause: minimal back provides less anchoring, so fit must be precise. Size down and check the waistband. If it still shifts during squats or sprints, a thong may not suit that activity. Stop adjusting and switch to a brief for high-impact sessions.
• Sheer or novelty cut shifts: Likely cause: design tradeoff. Sheer inserts and peek-a-boo cuts are intentionally less anchored. Reserve them for lower-impact wear or non-gym use. Match the cut to the activity; don't force a statement piece into a training role.

Product Facts That Matter for Fit

• Cotton Classic Brief - Fuchsia: Reduced waistband width to 3.5 cm and added firmer leg grip for more comfortable all-day wear, with internal pouch stitching for a finer aesthetic. The narrower waistband rolls less and the firmer leg grip helps prevent the leg openings from creeping up under shorts.
• Glide Micro Thong - Glacier: Minimal thong cut with just the pouch and string attached to a 1cm waistband, made from super soft, earth-loving recycled fabrication. The minimal cut and soft recycled fabric reduce bunching, and the 1cm waistband keeps a low profile under gym shorts.
• Icon Thong - Forest: Soft, quick-dry fabrication with a matching 4cm metallic waistband and a single front logo. Quick-dry fabric slides rather than grabs, which helps stop bunching during sweaty workouts.
• Score Sheer Slim Brief - Boysenberry: Slimmer at the hip cut with a sheer skin-baring insert curving over the top half of the back for a peek-a-boo effect. The sheer insert is intentionally less anchored, so this style may shift more during high-impact movement; best for lower-impact wear.

Underwear riding up under gym shorts is a solvable problem once you stop treating it as random. Diagnose the symptom, fix the size, then the cut, then the fabric. If a pair still moves after all that, it's simply the wrong tool for that workout. Keep one reliable training brief in rotation, save the statement pieces for their moment, and your gym sessions get a lot less distracting.