What Are the Benefits of Wearing Lined Workout Shorts for Men? | Liner Types Compared

Lined workout shorts build a brief or compression layer into the outer short, adding coverage, reducing thigh friction, and skipping the separate underwear step during sweaty training.

A brief liner catches the thigh rub that shows up around mile three without a second waistband rolling under the outer short. The benefits come from the design, not magic fabric: what you get depends on which liner the short uses, how it fits, and how you wash it afterward.

What Does A Built-In Liner Actually Do?

A liner gives you coverage and support without separate underwear, and on well-made shorts it cuts the friction and trapped moisture that cause thigh chafing. Nike and On both list inner briefs, compression liners, and 2-in-1 inner tights as their core structures. Four design benefits show up across current models:

• Support and coverage. The liner holds everything steady so the outer shell can stay loose and airy.
• Less chafing potential. A compression liner hugs the inner thigh, the spot that rubs first. It reduces skin-on-skin friction — it doesn’t guarantee zero chafing.
• Moisture handling. Many liners use moisture-wicking polyester/spandex blends, and some list antimicrobial treatment. Those are per-model claims, not a blanket promise.
• Simpler layering. One piece instead of two means no waistband stack, no riding briefs, and a faster kit decision.

Quick-drying outer fabric and four-way stretch round out the package on shorts like On’s Performance 2/1 line.

Brief Liner, Compression Liner, Or 2-In-1 Tight: Which Do You Need?

These three are not interchangeable. A brief liner is the lightest option, behaving like built-in underwear — good for easy runs and warm weather. A compression liner adds graduated squeeze and support, which suits longer runs and lifters who want the thigh held tight. A 2-in-1 inner tight gives the most coverage, running closer to midthigh, and works well for cold mornings or high-friction sessions.

Match the liner to the movement, not just the inseam. Squats and lunges expose gaps and pinching faster than a jog, so test the liner in a deep squat before you commit. If the brief rides up or the leg opening gaps, the size or style is wrong, not the concept.

What Do Lined Shorts Cost In The US Right Now?

Listed prices run from roughly $42 to $120, and liner style tracks with price more than inseam does. Nike’s Miler 7-inch brief-lined short sits at $42; On’s ultralight run-training short with a quick-drying inner lining lists at $120.

Prices and availability shift by date, color, and size, so treat these as a snapshot. Pockets also vary by model — some liners carry a phone pocket, others put storage in the outer shell with a zippered rear pocket. Confirm which before buying if you run with a phone.

If you want the shortlist already narrowed by liner type, inseam, and price, our tested lined workout shorts roundup covers the pairs worth your money.

Where Do People Get Lined Shorts Wrong?

Most complaints trace back to three fixable mistakes. Treating “lined” as proof of anti-chafing, odor control, or medical support is the first — those are model-specific traits, and a cheap liner can chafe as badly as no liner. Wearing underwear under a snug brief liner is the second; the extra layer can bunch, trap sweat, and create new friction, though some men genuinely prefer the added coverage. Buying by inseam alone is the third, because liner fit, seam placement, and waistband security matter more than the number on the tag.

Wash per the care label, and dry the liner completely. A sweat-soaked liner left damp is the fastest way to make a good pair feel bad on the next run. On’s product pages spell out the design intent — inner briefs, fast-drying shells, and stretch — and a quick read of the On lined running shorts lineup shows how much the liner changes from one model to the next.