Helion™ is On’s proprietary superfoam, developed to bring together comfort, energy return and structural resilience in a single midsole material. Introduced in 2019, it was designed to overcome the compromises typically found in running shoe cushioning systems.
Helion™ is On’s proprietary superfoam, developed to bring together comfort, energy return and structural resilience in a single midsole material. Introduced in 2019, it was designed to overcome the compromises typically found in running shoe cushioning systems.
Traditional foams often force a choice between softness and support, or between responsiveness and long-term durability. Helion™ eliminates that trade-off. Its unique molecular structure combines rigid and flexible elements along the same polymer chains. This allows the foam to compress when cushioning is needed and rebound quickly when energy return is required.
The performance of Helion™ remains stable in a wide range of temperatures. Whether in cold winter mornings or hot summer road sessions, the foam resists hardening or softening, keeping your stride consistent and supported.
In On shoes, Helion™ often works alongside CloudTec® cushioning pods and the Speedboard® plate to form an integrated system. This combination enables soft landings, explosive toe-offs and a smoother overall ride. The foam also maintains its structural integrity over time, reducing compression set and helping shoes last longer both in comfort and performance.
Shoes with Helion™
Men | Training / Gym
Cloud X 4
Push your pace and power through circuits in the Cloud X 4, built for dynamic training and short runs on SA streets. With responsive Helion™ foam, a flexible X-shaped Speedboard®, and featherlight breathability from 100% recycled mesh, it's your all-in-one training partner.
Women | Training / Gym
Cloud X 4
From HIIT sessions in the studio to quick loops around the block, the Cloud X 4 delivers lightweight comfort and agile performance. With a sleek, breathable upper and eco-conscious design, it's made for South African women who move with purpose.
Women | Training / Gym
Cloud X 4 AD
Whether you're smashing circuits or heading to a café meetup, the Cloud X 4 AD combines agile support with breathable style. Built with sustainable materials and performance-ready cushioning, it's the ideal all-rounder for active South African days — gym to street.
Men | Training / Gym
Cloud X 4 AD
From HIIT in Sandton to casual errands in Stellenbosch, the Cloud X 4 AD delivers light, responsive performance wherever the day takes you. With CloudTec® cushioning, a fork-shaped Speedboard®, and a sleek recycled mesh upper, it's your go-anywhere training and lifestyle hybrid.
Men | Training / Gym
Cloud X Z5
Power through track drills or weight circuits with the On Cloud X Z5 — built for men who demand versatility. With explosive Helion™ cushioning, a responsive Speedboard®, and grippy outsole traction, it's your ultimate tool for high-tempo training and hybrid workouts.
Men | Running
Cloudeclipse
Crush long runs with comfort in the Cloudeclipse. On's max-cushioned road runner designed for big distances and bigger goals. Double-layer CloudTec Phase cushioning combines with Helion™ superfoam and a flexible Speedboard® to deliver a smooth, forward-rolling ride that keeps you going strong.
Women | Running
Cloudeclipse
From early morning routes in KZN to late evening jogs in the suburbs, the Cloudeclipse wraps your feet in plush, responsive comfort. With soft landings, lightweight Helion™ foam, and a breathable recycled upper, it's perfect for long-distance efforts or gentle recovery runs.
Men | Running
Cloudflow 4
Designed for fast sessions and sharp goals, the Cloudflow 4 brings lightweight energy to Jozi’s intervals and CPT’s tempo runs. CloudTec® cushioning and a Speedboard® plate deliver a responsive ride from 5Ks to 21km.
Women | Running
Cloudflow 4
From parkruns to weekend races, the Cloudflow 4 moves with you. It’s ultra-light, breathable, and built to respond — giving you style and speed whether you’re training in Sandton or chasing splits in Umhlanga.
Women | Running
Cloudflow 5
Light, fast, and smooth. The Cloudflow 5 cushions every pace change with Helion™ HF foam and rolls you forward with a responsive Speedboard®. Great for 5km intervals, travel runs, or race day in the heat.
Men | Running
Cloudflow 5
Dial into your speed. The Cloudflow 5 blends Helion™ HF foam and a nylon Speedboard® for snappy transitions and a fast, propulsive ride. Perfect for tempo runs in Johannesburg or chasing PB's on Durban tarmac.
Women | Running
Cloudflyer 5
The Cloudflyer 5 wraps your foot in plush comfort while staying light and stable. From morning miles to city commutes, it delivers soft landings and secure strides all day long.