On Cloudswift 4 AD 'Black / Rock' (3MF10570080) — Adaptive-Fit Urban City Running Shoe

What Is the On Cloudswift 4 AD ‘Black / Rock’?

The On Cloudswift 4 AD ‘Black / Rock’ (Style Code: 3MF10570080) is On Running’s city running shoe built for the city runner’s actual life — not the idealised run of the training plan, but the run that competes with everything else in the day for the time and the energy to happen. The Cloudswift is On’s urban running platform, distinct from the Cloudsurfer’s road performance orientation in its optimisation for the specific demands of city pavement: harder, more uniform surfaces that require more consistent cushioning across the full footstrike; the stop-and-start rhythm of city running where traffic lights, crossings, and pedestrian navigation interrupt continuous pace; and the mixed-surface urban environment where pavement transitions to wet stone to metal grating to tile in the space of a single block. The AD — On’s Adaptive fit system — removes the one friction point that sits between the city runner and the run: lacing. No knot, no adjustment, no two minutes of preparation. The shoe adapts to the foot’s shape and volume and holds it there, ready to run from the moment it is on the foot. Black / Rock is the city’s own two-tone palette — the black of asphalt, pre-dawn sky, and building shadow; the rock grey of granite, concrete, and urban infrastructure that has acquired patina. At $145, the Cloudswift 4 AD is the same price as the Cloudsurfer ‘All Black’ — a shoe designed for the same activity at the same price point, for a completely different running context. US M7–M11 / W8.5–W12.5 / EU 40–45.

Quick Facts

• Brand: On Running (Zurich, Switzerland — est. 2010)
• Model: Cloudswift 4 AD — fourth-generation urban city running shoe with Adaptive fit system
• Style Code: 3MF10570080
• Colorway: Black / Rock — black upper + rock grey midsole and outsole
• Closure: AD Adaptive fit system — no laces; self-adapting secure hold
• CloudTec®: Urban-tuned — pod configuration for city pavement impact; consistent cushioning for harder uniform surfaces
• Foam: Helion™ — energy return for stop-and-start city rhythm
• Outsole: Mixed-surface urban rubber — pavement, wet stone, metal, tile
• Gender: Men’s / Unisex sizing
• Sizing: US M7–M11 / W8.5–W12.5 / EU 40–45
• Price: $145
• Category: Urban Running / City / Adaptive Fit
• Fit: Adaptive — self-adjusting to foot shape and volume; true to size

Specs & Technologies

The AD System — How On’s Adaptive Fit Works

The AD (Adaptive) system is On’s engineered alternative to conventional lace-up closure — designed specifically for the urban running context where the time and effort of lacing is a genuine friction point between the runner and the run. The system works through a combination of engineered upper structure and adaptive tension: the upper is constructed with a three-dimensional knit or mesh architecture that has directional tension properties, shaped to conform to the foot’s natural volume rather than requiring manual adjustment to match it. When the foot enters the shoe, the adaptive upper wraps to the foot’s specific shape — accommodating the variation between individual feet (higher instep, wider forefoot, lower arch) without the runner needing to adjust anything. The hold is secure enough for running — not a loose slip-on but a fit that holds the foot firmly through the lateral and directional forces of running footstrikes and direction changes — while being effortless to put on and take off. The practical impact for the city runner: the Cloudswift 4 AD removes the decision cost that lacing imposes. In the morning, the shoe goes on and the run begins. After the run, the shoe comes off and the day continues. The friction between ‘I should run’ and ‘I am running’ is reduced to the time it takes to slip the shoe onto the foot.

Why City Running Needs Its Own Platform

City running and road running look similar from the outside but make different demands on the shoe. Three specific differences define the Cloudswift’s distinct platform requirements relative to the Cloudsurfer’s road performance focus:

Surface character: Road running surfaces — dedicated running paths, roads with even pavement — are relatively consistent in texture and impact hardness. City surfaces are not: within a single city block, the runner transitions from smooth asphalt to paved stone to metal drainage grating to tiled plaza to wet polished concrete, each with different surface hardness, different traction requirements, and different impact characteristics. The Cloudswift’s urban-tuned CloudTec® and mixed-surface outsole are calibrated for this variability, not for the more consistent surface of dedicated road running.

Running rhythm: Road running at a consistent pace imposes a regular cadence on the shoe’s cushioning and energy return demands. City running does not: traffic lights, pedestrian crossings, other people, and the unpredictable geometry of urban navigation impose a stop-and-start rhythm that requires the shoe to be responsive at both the sprint pace of the gap in traffic and the easy pace of the long clear block. The Cloudswift’s Helion™ tuning is calibrated for this range; the Cloudsurfer’s Speedboard® propulsion plate is optimised for consistent pace performance.

Time economy: City running competes with everything else in the urban day for the time to happen. Every minute of preparation — including the two minutes of lacing — is a minute subtracted from either the run itself or the rest of the day. The AD system addresses this directly: the Cloudswift 4 AD is the shoe for the runner for whom the decision to run and the act of running are separated only by the time it takes to put the shoe on.

Black / Rock — The City’s Two-Tone Palette

The city has two primary colours, and they are the colours of its materials under different conditions of light. Black is the colour of the city at its most functional and its most atmospheric: the asphalt that city runners run on (absorbing heat and light in equal measure); the pre-dawn sky above the buildings before the run begins; the shadow of the building at noon when the sun is directly overhead and everything the light does not reach is absolute. Black is the city’s resting state — the colour that the city wears when it is not lit, when it is not performing for anyone, when it is simply present and functional. Rock is what black becomes when light touches it: the grey of granite kerbing and concrete paving and the particular shade of urban infrastructure that has been present long enough to acquire a surface history — not the clean grey of new concrete but the darker, more complex grey of material that has been rained on and trafficked and aged into something that is simultaneously grey and brown and blue depending on the light and the angle. On the Cloudswift 4 AD, Black occupies the upper and Rock occupies the midsole and outsole: the surface and the foundation, the visible and the structural, in the two-tone relationship that the city itself uses.

Cloudswift 4 AD vs. Cloudsurfer — Same Price, Different Running Context

Decision rule: if your running is in the city — variable surfaces, unpredictable rhythm, and a preference for the fastest possible on/off — Cloudswift 4 AD. If your running is road-only at consistent training pace with a performance focus — Cloudsurfer.

Sizing — Men’s / Women’s / EU Conversion Table

The On Cloudswift 4 AD is sold in men’s / unisex sizing. Women typically size up approximately 1.5 sizes from their women’s US size (e.g., women’s US 7 → men’s US 8.5 / EU 42). The Adaptive fit system conforms to the foot’s shape — true to size is correct for most wearers; the self-adjusting upper accommodates minor volume variation without sizing adjustment.

Who Is the On Cloudswift 4 AD ‘Black / Rock’ For?

Three profiles: the city runner whose training environment is the urban street grid — variable surfaces, traffic-interrupted rhythm, and the specific demands of city pavement that the Cloudswift’s urban-tuned CloudTec®, Helion™, and mixed-surface outsole are calibrated for, at $145 with the AD system’s friction-free on/off as a built-in advantage for the runner whose morning is already full before the run begins; the lace-free running buyer who wants the security of a proper running shoe fit without the time and process of conventional lacing — the AD system’s adaptive hold is secure enough for the lateral and directional forces of running while being effortless to put on and take off, making it the right shoe for any runner for whom lacing is a genuine friction point rather than a preferred ritual; and the Black / Rock urban buyer who wants the Cloudswift’s most tonally resolved and most city-congruent colorway — black upper in the colour of asphalt and pre-dawn and building shadow, rock grey midsole and outsole in the colour of granite and aged concrete and urban infrastructure, the two tones that the city uses for itself.

Frequently Asked Questions

Q: What is the style code?
A: 3MF10570080.

Q: How does the AD Adaptive fit system work — is it a slip-on?
A: It is more than a slip-on and more secure than a conventional slip-on. The AD upper uses a three-dimensional engineered architecture with directional tension properties that conforms to the foot’s volume when the foot enters. The result is a secure hold suitable for running — the foot does not move within the shoe during footstrikes or direction changes — without any manual adjustment. It goes on and comes off easily, but holds firmly when running.

Q: What is the difference between the Cloudswift 4 AD and the Cloudsurfer at the same $145 price?
A: Different platforms for different running contexts. Cloudswift 4 AD: urban city running platform, AD lace-free adaptive fit, urban-tuned CloudTec® for variable city surfaces, stop-and-start rhythm. Cloudsurfer: road performance platform, lace-up, CloudTec® Phase sequential compression + Speedboard® propulsion plate for consistent pace on dedicated running surfaces. Same price, different running context. If your route is in the city with variable surfaces and rhythm — Cloudswift. If your running is road-only at consistent pace — Cloudsurfer.

Q: Can I use the Cloudswift 4 AD for road running outside the city?
A: Yes — it is a road running shoe and performs on pavement surfaces. However, the Cloudswift’s urban tuning (variable surface focus, stop-and-start rhythm) and the absence of the Cloudsurfer’s Speedboard® propulsion plate means it is less optimised for consistent road pace performance than the Cloudsurfer.

Q: Is the AD system secure enough for running? I’m used to laced shoes.
A: Yes. The AD system is designed specifically for running, not just walking. The adaptive upper holds the foot through the lateral and directional forces of running footstrikes and direction changes. It is not a casual slip-on — it is a structured running fit that happens to require no lacing.

Q: How does women’s sizing work?
A: Women size up approximately 1.5 sizes from their women’s US size (e.g., women’s US 7 → men’s US 8.5). Same On Running convention as all other On shoes in today’s lineup.

Q: Is this true to size?
A: True to size for most wearers. The Adaptive system’s self-adjusting upper accommodates minor foot volume variation without sizing adjustment — no need to size up for volume unless your foot is significantly wider than average.