On Cloudmonster 2 Unisex Marathon Running Shoes – Iron | Eclipse

On Cloudmonster 2 – Unisex Marathon Running Shoe

The On Cloudmonster 2 is On’s most cushioned and most energy-returning road running shoe — the second generation of the Cloudmonster platform, rebuilt from the ground up with a redesigned CloudTec® Phase midsole architecture, an upgraded Helion™ superfoam formulation, and a more responsive ride profile that retains every gram of the original’s legendary cushioning presence while delivering a more propulsive, more dynamic step. A shoe built for long-distance training and marathon performance, for runners who want maximum cushion without sacrificing ground feel or forward momentum.

Colorway

This style is offered in the Iron | Eclipse colourway — the darkest and most severe of the Cloudmonster 2’s dark-register colourways: a four-colour composition in cast-iron grey, deep steel blue, white, and black that operates entirely in the lower half of the value scale, the entire shoe resolved in dark, weighty, industrial tones with a single white accent as the composition’s only high-contrast element. Where the Black | Eclipse achieves its monochrome through an absolute single-colour total, the Iron | Eclipse achieves its darkness through layered variation — three distinct dark tones in sequence from upper to sole, plus the white logo as a controlled declaration in the darkest zone — the shoe’s darkness as a structured, considered architecture rather than a flat field. The upper’s primary body is rendered in a deep cast-iron grey: a cool, fully desaturated dark grey in the register of raw cast metal, of volcanic basalt, of industrial equipment before its surface treatment is applied. This cast-iron grey sits in the lower quarter of the value scale — dark enough to read as nearly black in low light, light enough to reveal its grey character in direct daylight, the grey that serious, committed, functional objects are made from when colour is not the point. The upper’s surface texture — the engineered mesh’s woven structure — provides the composition’s only variation within the iron field, the colour itself as resolved and as consistent as the metal it resembles. Against this iron-grey ground, a large white On circular logo anchors the lateral midfoot as the composition’s single high-contrast element — the white circle as a graphic declaration in the colourway’s darkest upper zone, the brand mark at maximum luminosity against the iron ground, the only point in the composition where the eye is given a clear, bright destination. A wide diagonal stripe runs the full lateral lower perimeter in a deep steel blue: a dark, fully desaturated blue in the register of industrial steel under artificial light, of deep ocean water seen from above at dusk, of the colour that results when navy is drained of its ceremony and left with only its structural quality — a blue that reads as almost black at distance and reveals its blue character only at close range in specific light conditions. The ON RUNNING wordmark is woven into the steel-blue stripe in the same dark register, the text tonal within the stripe’s dark ground, legible at close range only. A black collar frames the shoe’s opening at maximum darkness — darker than the iron upper, darker than the steel-blue stripe, the black as an absolute frame at the entry point that anchors the upper’s darkest elements at the shoe’s crown. Dark near-black laces thread the lacing system in tonal continuity with the collar. The Cloudmonster 2 midsole below continues into full black: the square-aperture CloudTec® Phase pods in pure black, the cushioning architecture absorbed entirely into the darkest register, the sole volume as dark and as absolute as the collar above. A black outsole grounds the composition at contact point in seamless continuity with the midsole, the black at the base as uncompromising as the black at the collar, the shoe’s darkest elements at its topmost and bottommost zones with the iron and steel-blue registers between them. Iron above. Steel blue at the stripe. White at the logo. Black at the collar, midsole, and outsole. The composition’s four elements in a descending value sequence from logo to ground, the white as the single luminous exception in an otherwise entirely dark, structured, industrial palette.

Key Features

• Cast-Iron Grey Engineered Mesh Upper – Deep cool-grey upper in the register of raw cast metal and volcanic basalt — dark enough to read as near-black in low light, revealing its grey character only in direct daylight, the industrial ground for the composition’s three dark accent registers
• Deep Steel-Blue ON RUNNING Stripe – Dark industrial-steel blue diagonal stripe with tonal ON RUNNING wordmark — a blue that reads as near-black at distance and reveals its blue character only at close range, the composition’s most tonally hidden element
• White On Logo at Maximum Contrast – Large white circular On logo against the iron-grey upper — the composition’s single high-contrast element, the brand mark as the only bright destination in an entirely dark palette
• All-Black Midsole and Outsole – Pure black CloudTec® Phase square-aperture midsole with seamless black outsole — the second all-black midsole in the Cloudmonster 2 range alongside the Black | Eclipse, the darkest sole volume anchoring the iron upper above
• Black Collar and Near-Black Laces – Pure black collar and dark near-black laces — the composition’s absolute dark frame at the entry point and lacing system, the black bookending the shoe’s crown to match the black sole below
• Redesigned CloudTec® Phase Midsole – Second-generation square-aperture cloud pods in black — more responsive, more phase-connected, and more propulsive than the original Cloudmonster while retaining maximum cushioning volume
• Helion™ Superfoam – On’s proprietary high-rebound foam formulation — lightweight, temperature-stable, and energy-returning across long-distance training loads

Product Details

• Brand: On Running
• Model: Cloudmonster 2
• Gender: Unisex
• Use: Road running, marathon training, long-distance performance
• Closure: Lace-up
• Upper Material: Cast-iron grey engineered mesh with deep steel-blue ON RUNNING diagonal stripe, white On logo, and black collar
• Midsole: Helion™ superfoam with CloudTec® Phase square-aperture pods in black
• Outsole: Rubber in black

Size Guide

Please refer to the size chart before ordering. If you are between sizes or prefer a roomier fit, we recommend choosing the larger size.

Please select all required options before checkout. Colors may vary slightly depending on screen settings — please refer to product images for accurate representation.