TWL - MENS LINED SPEED RUNNING SHORTS - 4" - BLACK

170 grams. Built-in liner. Engineered for speed. The most technical running short TWL has ever made.

The TWL Speed Shorts are the lightest, most performance-focused short in the TWL range. Purpose-built for runners and athletes who need every detail working in their favour when speed matters most.

At just 170g in a medium, crafted from TWL's proprietary Vapor-Flex™ fabric, with a built-in compression liner and a feature set designed for long-distance efforts and race day — these are the shorts that get out of the way and let you run.

VAPOR-FLEX™ — FEATHERWEIGHT PERFORMANCE FABRIC:

The Speed Shorts are built from Vapor-Flex™ — TWL's lightest performance shorts fabric, a 95% Polyester / 5% Elastane blend engineered specifically for running and high-cadence training.

• 95% Polyester: Ultra-lightweight and highly moisture-wicking — pulls sweat away from the outer shell instantly, keeping the fabric dry and as light as the moment you put them on. 
• 5% Elastane: Just enough stretch for the fabric to move with your stride without any resistance. Not compression — freedom. The Elastane works quietly so you never notice it
• 170g total weight (size medium): For reference, a standard training short weighs 200-250g. At 170g, the Lined Speed Shorts are in a different category entirely.

BUILT-IN COMPRESSION LINER — SUPPORT WITHOUT RESTRICTION:

The Speed Shorts feature an integrated lightweight compression liner — not a loose mesh insert, but a low-profile compression brief that moves with your body as a single unit. The liner eliminates inner-thigh chafing during long-distance efforts, provides muscle support without compressing so hard it restricts blood flow, and means you never need to layer shorts over compression tights again.

For runners who've experienced the distraction of a shifting liner, the integrated compression construction is one of the Speed Shorts' most important performance decisions.

ERGONOMIC GUSSET — BUILT FOR HIGH-CADENCE MOVEMENT:

An ergonomic gusset in the liner at the crotch panel allows full hip flexion and leg drive at high cadence without the shorts pulling, binding, or restricting range of motion during your stride. Designed specifically for running biomechanics — not adapted from a training short that happens to be lightweight. Every panel is intentional.

POCKETS AND STORAGE — EVERYTHING YOU NEED, NOTHING YOU DON'T:

Serious running shorts need seriously clever storage — and the Speed Shorts deliver without adding bulk or disrupting the silhouette:

• Integrated liner storage pockets: Secure inbuilt pockets within the liner hold your phone, keys, gels, or nutrition without bounce — sitting flush against your thigh
• Low-profile zip pocket: External small zippered pocket for valuables you need accessible but secure — cards, key fob, and small items locked in place without a visible bulge
• Rear utility straps: Elastic carry loops at the rear waistband — loop a towel, tie a shirt, or secure lightweight gear when training heats up and layers come off

ELASTIC WAISTBAND WITH DRAWSTRING — SECURE WITHOUT BULK:

The Speed Shorts use a 3cm elastic waistband with a thin, light internal drawstring — the combination that serious running shorts use for good reason. The thin elastic provides a secure, consistent but lightweight hold around the waist without any adjustment needed. The thin drawstring lets you dial in the exact fit before you start.

4-INCH INSEAM — THE RUNNER'S LENGTH:

The 4-inch inseam is the standard choice for performance running — short enough for full hip extension and unrestricted leg drive at any cadence, without the exposure of a split short. Suitable for interval sessions, long runs, Hyrox, and race day without changing shorts between disciplines.

KEY SPECS:

• Fabric: TWL Vapor-Flex™ — 95% Polyester / 5% Elastane
• Weight: 170g (size medium) — ultralight running construction
• Inseam: 4 inches
• Liner: Built-in light compression liner — low-profile, chafe-free
• Gusset: Ergonomic — engineered for running biomechanics
• Waistband: 3cm Elastic with thin drawstring — secure hold, adjustable fit, no bulk
• Pockets: Liner storage pockets + low-profile zip pocket + rear utility straps
• Moisture-wicking: Yes — stays light and dry through long efforts

BUILT FOR:

• Road running & trail running
• Interval training & track sessions
• Hyrox & hybrid racing
• Race day
• High-cadence, long-distance efforts