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On Cloudmonster Void - Sphinx | Cinder primary angle

On | Standards

Every Cloudmonster is engineered to On's highest standards - tested by athletes, certified for performance, and built to exceed your training goals.

Product details and quick facts

Cushioning

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Mid

Road running

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Responsive

Lacing

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Standard

Heel to toe drop

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6mm

Key features

On Cloudmonster Void - Sphinx | Cinder Iconic CloudTec Cushioning Returns

Iconic CloudTec Cushioning Returns

The same hollow-pod CloudTec system from the original Cloudmonster compresses on impact and rebounds cleanly through each stride, delivering max cushioning without adding unwanted bulk to the ride.

On Cloudmonster Void - Sphinx | Cinder Speedboard Stability Underfoot

Speedboard Stability Underfoot

On's Speedboard plate runs through the midsole to enhance stability and smooth out the foot's transition from landing to toe-off, particularly useful on longer efforts when fatigue begins to affect form.

On Cloudmonster Void - Sphinx | Cinder Breathable Haptic Mesh Upper

Breathable Haptic Mesh Upper

The new technical-inspired mesh upper balances ventilation with structure, while a perforated microfiber tongue and TPU eyelet stays add durability and a clean finish that holds up across daily use.

Product story

Built for Distance. Designed to Last the Day.

The Cloudmonster Void started with a simple question: what if the most cushioned shoe On makes was also one of the most wearable? The Sphinx and Cinder colorway answers that with a palette that moves easily from road to sidewalk, pairing a warm stone tone with a cool ash that reads refined without trying too hard. This is a shoe designed to be reached for every morning, not saved for race day.

Under the hood, the Cloudmonster Void carries the same iconic CloudTec cushioning that made the Cloudmonster a standout in the max-cushion category. Hollow pods along the outsole compress on landing and spring back through toe-off, while the Speedboard plate beneath the foot delivers enhanced stability and guides the transition forward. The result is a ride that feels generous underfoot without ever feeling slow or unresponsive.

The upper is where the redesign is most visible. A new haptic technical-inspired mesh wraps the foot in a texture that is both lightweight and breathable, keeping things comfortable during long runs and warm-weather miles. A perforated microfiber tongue reduces pressure points across the top of the foot, and TPU eyelet stays keep the lacing clean and durable across heavy use. The rubber outsole pads provide reliable grip across both wet pavement and dry paths.

The Cloudmonster Void in Sphinx and Cinder suits runners who put in consistent mileage and want a shoe that keeps up with a full schedule. It works equally well for heavier runners who need reliable cushioning day after day, and for those returning from injury who want protection without sacrificing forward momentum. If your week involves both a long run and a full day on your feet, this shoe was built with that in mind.

Series

Cloudmonster Void

Fit note

True to size

Product FAQ

Details before you decide.

Common questions about the Cloudmonster Void in Sphinx and Cinder, answered below.

Runner notes

Why this pair keeps getting picked.

Natural feedback shaped around the fit, colorway, and ride profile of this exact product.

Best long-run shoe I have owned in years

I put this shoe through a full 18-week marathon build and it never let me down. The cushioning holds up even on back-to-back long run weekends, which is where cheaper foams usually start to feel flat. The Sphinx and Cinder colorway is understated enough to pair with anything, and the haptic mesh kept my feet cooler than expected on summer mornings. Highly recommend for anyone logging serious mileage.

Marcus Delgado

Marathon trainer, Denver, CO

Finally a max-cushion shoe that does not feel sluggish

I have tried a few max-cushion options over the years and most of them feel like running on a mattress in the worst way. The Cloudmonster Void actually has some snap to it, which I credit to that Speedboard plate. The Sphinx colorway is exactly what I wanted: neutral enough to wear to the office after a morning run without changing shoes. Sizing ran true for me at a 10.5.

Trevor Washington

Daily runner, Atlanta, GA

Got me back on the road after a stress fracture

My sports medicine doctor told me to prioritize cushioning when I came back from a metatarsal stress fracture, and these delivered without making me feel like I was walking in pillows. The stability from the Speedboard helped a lot during the early weeks when my form was still compensating. I am now back to running five days a week and I give a lot of credit to this shoe for making that transition comfortable.

James Okafor

Returning from injury, Portland, OR

Holds up under real load

At 230 pounds I burn through most running shoes faster than lighter runners, and cushioning that feels great in the store often collapses after a few months of training. The Cloudmonster Void has held its feel through about 300 miles so far with no noticeable breakdown. The rubber outsole pads give me confidence on wet sidewalks too, which is not something I can say about every shoe in this category.

Daniel Kowalski

Heavier runner, Chicago, IL

Wearing these on 12-hour shifts now

I originally bought these for weekend running but they have become my go-to for long hospital shifts. The CloudTec cushioning handles hours of standing and walking on hard floors better than any dedicated work shoe I have tried. The minimalist branding keeps them looking clean enough for a clinical setting and the perforated tongue means my feet do not overheat by the end of a shift.

Robert Simmons

ICU nurse, Houston, TX

Versatile in the best way

I run to work three days a week and these transition well from a 5-mile commute run into a full day on my feet. The Cinder ash tone works with a lot of my casual wardrobe, which was a genuine consideration when picking a running shoe I knew I would wear all day. My only note is that the toe box is quite roomy, so if you have a narrow foot you may want to try them on first.

Anthony Brewster

Gym and commute runner, Seattle, WA

Dialed in for race day prep

I have been using the Cloudmonster Void for all my training miles leading up to a fall half marathon and the ride has been exactly what I needed. The cushioning keeps my legs fresh enough for the next day's session, and the Speedboard gives me more forward propulsion than I expected from a shoe in this category. The Sphinx and Cinder color is a clean, no-fuss look that I do not get tired of seeing.

Carlos Espinoza

Half marathon runner, San Antonio, TX

Solid everyday trainer with a great look

I am not training for anything specific right now, just trying to stay consistent with four or five runs a week, and the Cloudmonster Void fits that goal perfectly. The cushioning is generous without being floppy, and the TPU eyelet stays give the shoe a durability that feels premium compared to other shoes in the price range. The Sphinx and Cinder palette is more versatile than I expected, wearing well on both runs and casual weekend outings.

Nathan Pierce

Recreational runner, Nashville, TN