On Cloudmonster 1 'Glacier / Alloy' (3MF30741536) — Original Oversized CloudTec® Maximum Cushion Road Running Shoe

What Is the On Cloudmonster 1 ‘Glacier / Alloy’?

The On Cloudmonster 1 ‘Glacier / Alloy’ (Style Code: 3MF30741536) is the shoe that proved On’s maximum-cushion concept was worth building a platform around. The Cloudmonster 1 is the original generation — the first application of On’s CloudTec® technology at maximum pod scale and maximum stack height, establishing the oversized pod geometry, the high-stack Helion™ midsole, and the wide stability base that every subsequent Cloudmonster (2, 3, Void, Hyper) has taken as its starting point and refined in its own direction. The Glacier / Alloy colorway makes the Cloudmonster 1’s foundational character legible in its palette: Glacier is the blue-grey of compressed ancient ice, a material formed by millennia of pressure into something denser and more permanent than the substance it began as; Alloy is the grey of precision-engineered metal, a material made by combining elements to produce properties that none of them possess alone. Both are materials formed by applied force — both are the Cloudmonster 1’s technological ambition expressed as colour. At $135, the Cloudmonster 1 is the most accessible shoe in today’s On Running range — $10 below the Cloudsurfer, $24 below the Cloudstratus, $34 below the Cloudtilt — making it the entry point into On’s maximum-cushion category. US M7–M11 / W8.5–W12.5 / EU 40–45.

Quick Facts

• Brand: On Running (Zurich, Switzerland — est. 2010)
• Model: Cloudmonster 1 — first generation; the original maximum-cushion CloudTec® platform
• Style Code: 3MF30741536
• Colorway: Glacier / Alloy — compressed-ice blue-grey + precision-metal silver-grey
• Cushioning: Original oversized CloudTec® — the largest pod geometry in On’s history at time of introduction
• Foam: First-generation Helion™ Superfoam at maximum stack height
• Upper: Structured training mesh — for long-run security over the wide midsole base
• Outsole: Road rubber compound — mixed-surface daily training
• Base: Wide stability footprint — maximum cushioning requires maximum base
• Gender: Men’s / Unisex sizing
• Sizing: US M7–M11 / W8.5–W12.5 / EU 40–45
• Price: $135
• Category: Road Running / Maximum Cushion / High-Stack / Origin Platform
• Fit: True to size; roomy in the toe box to accommodate foot splay on long runs

Specs & Technologies

What ‘Oversized CloudTec®’ Means — The Cloudmonster’s Foundational Decision

Every On shoe before the Cloudmonster used standard-scale CloudTec® pods — hollow cloud elements sized for the balance of cushioning, energy return, and ground-feel that running performance requires. The Cloudmonster 1’s foundational design decision was to ask a different question: what if the pods were not sized for balance but for maximum? What is the largest a CloudTec® pod can be made while still allowing the foot to feel connected to the ground, while still providing the lateral stability that running requires, while still being light enough to run in? The answer established the Cloudmonster’s defining visual signature — the dramatically oversized pod geometry that is immediately recognisable from any angle and that makes the Cloudmonster the most visually assertive shoe in On’s lineup — and its primary functional proposition: a cushioning depth that standard-scale pods cannot approach, specifically designed for the runner who prioritises protection from impact over propulsive energy return. At maximum pod scale combined with maximum Helion™ stack height, the Cloudmonster 1 delivers the deepest cushioning in On’s road running range — the most complete impact absorption available in an On shoe without the dual-layer architecture of the Cloudstratus.

‘Glacier’ — The Blue-Grey of Compressed Time

Glacier is the specific blue-grey of glacial ice — not the pale translucent blue of surface ice or fresh snow, but the deeper, denser blue-grey of ice in a glacier’s interior, where centuries of compression have forced out the air and driven the ice’s crystalline structure into a tighter, more mineral state. Glacial ice at depth is blue because it absorbs the longer red wavelengths of light and transmits and scatters the shorter blue wavelengths; the compression that produces this optical quality also produces the ice’s characteristic density and near-translucency, which gives glacial ice its specific visual quality of being both opaque and luminous at the same time — a material that holds light rather than simply reflecting it. As a colour name, Glacier carries all of this: it is a blue-grey with depth and density, formed by time and pressure, colder and more precise in its blue than the casual blue-greys of industrial or urban reference. On the Cloudmonster 1, Glacier describes a material that is as purposeful and as formed-by-force as the shoe’s own construction.

‘Alloy’ — The Grey of Engineered Combination

Alloy is the grey of a metallic material that has been deliberately engineered by combining elements — a grey that is the colour of intentionality applied to raw substance. Pure metals are rarely the most useful form of the metal: steel is iron alloyed with carbon; bronze is copper alloyed with tin; the aerospace aluminium alloys that On’s Swiss engineering ethos references are aluminium combined with copper, magnesium, and zinc to produce a material lighter than steel and stronger in proportion to its weight than any of its component elements alone. Alloy grey is the colour of these combinations: not the bright silver of polished pure metal and not the dark grey of unfinished steel, but the specific mid-grey of machined and finished engineered metal — a grey that reads as precise, purposeful, and made to specification. On the Cloudmonster 1’s midsole and structural elements, Alloy describes a material relationship that mirrors the shoe’s own engineering: components combined to produce performance properties that simpler constructions cannot approach.

The Cloudmonster 1 as Origin — What ‘First Generation’ Means

The Cloudmonster 1 is not the most refined version of the Cloudmonster concept. The Cloudmonster 2 introduced improved pod geometry and updated Helion™ formulation; the Cloudmonster 3 further refined the ride; the Cloudmonster Void and Hyper pushed the platform into new territories of stack height and construction. Each subsequent generation took the Cloudmonster 1’s proof-of-concept and found a dimension to improve. But the Cloudmonster 1 has something the later generations do not: it is the version that established that the concept was worth pursuing at all. Its oversized pods are the original maximum pod — not yet optimised by feedback from millions of running miles but pure in their initial ambition. Its Helion™ stack is the first application of the superfoam at maximum height — the experiment that confirmed the hypothesis. For the buyer who wants the Cloudmonster at its most essential and most original, the Cloudmonster 1 offers something the refined generations cannot: the concept in its purest first-generation expression, without the accumulated optimisation that subsequent versions applied. At $135, it is also the most accessible entry into the Cloudmonster platform — the lowest price in today’s On Running range.

On’s Four Models in Today’s Lineup — Complete Navigation

Decision rule for maximum cushion: Cloudmonster 1 for the highest stack height and most visually assertive oversized pod geometry at the lowest price in today’s range; Cloudstratus for dual-layer cushioning consistency and fatigue management over long mileage at $159.

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

The On Cloudmonster 1 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). Important: this is the opposite of the Salomon unisex convention — women size up on On Running, not down. The Cloudmonster 1’s toe box is roomy by design to accommodate foot splay on long runs — most runners find true size correct.

Who Is the On Cloudmonster 1 ‘Glacier / Alloy’ For?

Three profiles: the maximum stack height runner who wants the deepest single-layer cushioning in On’s road running range — the Cloudmonster 1’s original oversized pods at maximum Helion™ stack height deliver a cushioning depth that no other single-layer On shoe approaches, specifically for the runner who prioritises impact protection and cushioning feel over propulsive energy return; the Glacier / Alloy palette buyer who wants the Cloudmonster’s most geologically and materially grounded colorway — Glacier’s compressed-ice blue-grey formed by millennia of pressure and Alloy’s engineered-metal silver-grey formed by precise elemental combination, a two-tone palette where both colours are materials formed by applied force, reflecting the Cloudmonster 1’s own technological ambition; and the origin-platform collector who wants the Cloudmonster at its most essential and least-optimised — the first generation that proved the concept worth refining, available at $135 as the most accessible entry into the Cloudmonster family and the lowest price in today’s full On Running range.

Frequently Asked Questions

Q: What is the style code?
A: 3MF30741536.

Q: What makes the Cloudmonster 1 different from later Cloudmonster generations?
A: The Cloudmonster 1 is the original proof-of-concept: the first application of oversized CloudTec® pods at maximum Helion™ stack height, establishing the parameters that every subsequent Cloudmonster (2, 3, Void, Hyper) has refined. It is not the most optimised generation — it is the most essential, the concept in its purest first-generation form before iterative improvement applied.

Q: How does the Cloudmonster 1 compare to the Cloudstratus for maximum cushion?
A: Different approaches to maximum cushioning. Cloudmonster 1 ($135): oversized single-layer pods at maximum stack height — the deepest single-layer cushioning in On’s range, most visually dramatic pod geometry. Cloudstratus ($159): dual-layer stacked pods — cushioning depth through layer interaction and consistency, better fatigue management over long mileage. Choose Cloudmonster 1 for stack height feel and visual assertiveness at a lower price; Cloudstratus for dual-layer consistency and high-mileage fatigue management.

Q: What color is ‘Glacier’?
A: The specific blue-grey of glacial ice interior — where centuries of compression have forced out air and created denser, near-translucent ice that absorbs red light wavelengths and scatters blue. Deeper, denser, and colder in tone than casual blue-grey — a material colour formed by time and pressure.

Q: What color is ‘Alloy’?
A: The mid-grey of machined and finished engineered metal — not bright polished silver and not dark unfinished steel, but the precise mid-grey of metal that has been deliberately combined with other elements to produce performance properties that none of them possess alone. Precise, purposeful, and made-to-specification in its tone.

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). Opposite direction from the Salomon unisex sizing in today’s other lineup shoes. The toe box is roomy; most runners find true men’s size correct.

Q: Is this true to size?
A: Yes. The Cloudmonster 1’s toe box is intentionally roomy to accommodate foot splay on long runs. Most runners find true size correct; no need to size up for width.