Liner vs Linerless Running Shorts: Which Suits Your Training
By BOA | Running Shorts & Apparel | Made in the USA | Published: 2026-10-20
Category: Comparisons
Compare lined and linerless running shorts for training. Learn the trade-offs in coverage, comfort, and range of motion to pick the right pair.
Quick answer
For most training runs, lined shorts with a built-in mesh liner offer the best balance of support and simplicity. Choose linerless if you prefer to wear your own underwear or want maximum ventilation.
Coverage vs. range of motion
The inseam length and side splits directly affect how much leg movement you get. A 3-inch inseam with mid side splits gives moderate coverage while still allowing relaxed range of motion. A 1-inch inseam with high side splits maximizes freedom but leaves little to the imagination.
If you are training for speed or doing strides, the extra mobility of a shorter inseam can feel liberating. If you prefer a bit more fabric for gym stops or cool mornings, the longer option keeps you comfortable without feeling restrictive.
Liner comfort and support
A built-in mesh liner eliminates the need for separate underwear, reducing bulk and the chance of chafing from extra seams. It also stays in place during high-knee drills or hill repeats.
However, liners can feel warm in hot weather or trap moisture if you sweat heavily. Some runners simply prefer the feel of their own briefs, which is where linerless shorts come in.
The key pocket advantage
Both lined and linerless BOA shorts include an internal key pocket in the elastic waistband. That means you can carry a house key or small card without needing a separate belt or armband, regardless of which style you choose.
This feature is especially useful for short training runs where you want to travel light.
How to choose: lined vs linerless
- Lined shorts: Choose lined shorts if you want built-in support and don't want to worry about underwear. The mesh liner is moisture-wicking and comfortable, and it reduces chafing from extra layers. Check that the liner fits snugly but not too tight—size up if it feels restrictive.
- Linerless shorts: Choose linerless if you prefer to wear your own underwear or want maximum breathability. This style lets you control the base layer and can be cooler on hot days. When going linerless, pick moisture-wicking underwear to avoid chafing and keep dry.
- Inseam length: For moderate coverage and a relaxed feel, go with a 3-inch inseam. For maximum range of motion and a minimalist look, choose a 1-inch inseam with high splits. Try both lengths during a short run to see which feels better for your stride.
BOA shorts at a glance
- Men's Solid 3" Half Split Trainer Shorts: The BOA 3” Half Split Trainer features a 3-inch inseam with mid side splits, a built-in smooth mesh liner, and an elastic waistband with an adjustable drawstring and internal key pocket. It gives moderate coverage and relaxed range of motion, making it a versatile choice for daily training and longer runs.
Men's Solid 3" Half Split Trainer Shorts - Men's Solid 1" Elite Split Shorts: The BOA 1” Elite Short features a 1-inch inseam with high side splits, a built-in smooth mesh liner, and the same waistband with drawstring and key pocket. It offers maximum leg freedom and a minimalist feel, ideal for speed sessions and hot-weather racing.
Men's Solid 1" Elite Split Shorts
Who should choose what
Best for
- Runners who want built-in support and simplicity—lined shorts are ideal.
- Speedsters and racers who prioritize maximum leg freedom—go with the 1-inch split shorts.
Not for
- Runners who prefer to wear their own underwear—linerless shorts are a better fit.
- Those who want more coverage for casual wear—consider a longer inseam or different style.
