ShoeGeometry

On Cloudultra Pro vs Puma Voyage Nitro 4

Two shoes compared on measured geometry. Each cell carries a provenance badge; open a shoe for sources.

heel boneOn Cloudultra Pro: heel 39 mm, forefoot 33 mm (drop 6 mm); toe rocker 40 % of length, radius 63 % of length; heel bevel 15 % of length, 21 mm high at the back, reaching in front of the heel bone (the sole still curves up under it: a heel rocker).On Cloudultra Pro: toe rocker 40 % of lengthPuma Voyage Nitro 4: heel 38 mm, forefoot 32 mm (drop 6 mm); toe rocker 34 % of length, radius 41 % of length; heel bevel 11 % of length, 15 mm high at the back, ending about under the heel bone.Puma Voyage Nitro 4: toe rocker 34 % of length
  • On Cloudultra Pro39/33 mm · toe rocker 40 % · heel bevel 15 %
  • Puma Voyage Nitro 438/32 mm · toe rocker 34 % · heel bevel 11 %
Illustrative profiles, not photographs: drawn from published stack heights and photo estimates of the unloaded shoes on a common length (300 mm), heels aligned, toe to the left; dots mark where each toe rocker starts; the dotted vertical line is under the heel bone (12 % of length), so a heel curve reaching past it is a bevel in front of the heel bone. Dotted lines use typical values where a shoe has no measurement. Exact values are in the table below.

Which suits you

If you wantPickBecause
A smoother roll at toe-offOn Cloudultra Pro39.5 vs 34.2 % toe rocker
More cushioning under the heelAbout the same38.5 vs 38 mm heel stack
More under the forefootAbout the same32.5 vs 32 mm forefoot stack
A lower dropAbout the same6 vs 6 mm drop

From the values below, with differences inside measurement noise shown as about the same. This describes the shoes, not what is right for your feet; comfort in the first few runs decides.

MetricOn Cloudultra Pro
Trail · Trail
Puma Voyage Nitro 4
Trail · Trail
Heel-to-toe drop6 mmStated6 mmStated
Heel stack38.5 mmStated38 mmStated
Forefoot stack32.5 mmStated32 mmStated
Weight264 gStated272 gStated
Toe rocker40 %est.34 %est.
Rocker radius63 %est.41 %est.
Rocker rise angle24 degest.31 degest.
Rocker angle at toe64 degest.63 degest.
Toe tip over ground36 mmest.42 mm*est.
Visible rocker lift onset72.2 %est.74.4 %est.
Toe spring (relative)17.6 %est.20.8 %est.
Heel bevel length15.3 %*est.11.1 %est.
Heel bevel height21 mm*est.15 mmest.
Midsole width (forefoot)117.3 mmMeasured—
Midsole width (heel)91.6 mmMeasured—
Toe box shape75 %est.75 %est.
Interior forefoot width94.6 mmMeasured—
Toebox width74.6 mmMeasured—
Longitudinal stiffness34Derived—
Midsole firmness59Derived—
PlatePlate unknownNo plate
Primary foamDual-layer Helion HF (PEBA-based)NITROFOAM
List price$260$160

Key differences

  • Heel-to-toe drop is about the same: 6 mm for On Cloudultra Pro, 6 mm for Puma Voyage Nitro 4.
  • Heel stack is about the same: 38.5 mm for On Cloudultra Pro, 38 mm for Puma Voyage Nitro 4.
  • Forefoot stack is about the same: 32.5 mm for On Cloudultra Pro, 32 mm for Puma Voyage Nitro 4.
  • On Cloudultra Pro's weight is 264 g, 8 g lighter than Puma Voyage Nitro 4's 272 g.
  • On Cloudultra Pro's toe rocker is 40 % of length, 5 % of length longer than Puma Voyage Nitro 4's 34 % of length.

Read more about both shoes

We measure the shape. For how they feel over many miles, and for lab tests of cushioning, grip and fit:

On Cloudultra Pro

Puma Voyage Nitro 4

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