ShoeGeometry

Hoka Skyward X 2 vs Mizuno Sky Prime

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

heel boneHoka Skyward X 2: heel 48 mm, forefoot 43 mm (drop 5 mm); toe rocker 35 % of length, radius 40 % of length; heel bevel 12 % of length, 22 mm high at the back, ending about under the heel bone.Hoka Skyward X 2: toe rocker 35 % of lengthMizuno Sky Prime: heel 47 mm, forefoot 41 mm (drop 6 mm); toe rocker 32 % of length, radius 35 % of length; heel bevel 12 % of length, 30 mm high at the back, ending about under the heel bone.Mizuno Sky Prime: toe rocker 32 % of length
  • Hoka Skyward X 248/43 mm · toe rocker 35 % · heel bevel 12 %
  • Mizuno Sky Prime47/41 mm · toe rocker 32 % · heel bevel 12 %
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-offAbout the same35 vs 32.5 % toe rocker
More cushioning under the heelAbout the same48 vs 47 mm heel stack
More under the forefootHoka Skyward X 243 vs 41 mm forefoot stack
A lower dropHoka Skyward X 25 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.

MetricHoka Skyward X 2
Max cushion · Road
Mizuno Sky Prime
Max cushion · Road
Heel-to-toe drop5 mmDerived6 mmStated
Heel stack48 mmStated47 mmStated
Forefoot stack43 mmStated41 mmStated
Weight298 gStated295 gStated
Toe rocker35 %est.32 %est.
Rocker radius40 %est.35 %est.
Rocker rise angle32 degest.33 degest.
Rocker angle at toe66 degest.65 degest.
Toe tip over ground46 mm*est.44 mm*est.
Visible rocker lift onset75.2 %est.78 %est.
Toe spring (relative)21.9 %est.21.1 %est.
Heel bevel length12 %*est.11.8 %est.
Heel bevel height22 mm*est.30 mm*est.
Midsole width (forefoot)125.7 mmMeasured—
Midsole width (heel)103.7 mmMeasured—
Toe box shape74 %est.—
Interior forefoot width94.6 mmMeasured—
Toebox width72.7 mmMeasured—
Longitudinal stiffness79Derived—
Midsole firmness44Derived—
PlateCarbon plateNo plate
Primary foamPEBA top layer + supercritical EVA baseMIZUNO ENERZY NXT+ (PEBA) over ENERZY NXT (EVA)
List price$225$200

Key differences

  • Hoka Skyward X 2's heel-to-toe drop is 5 mm, 1 mm lower than Mizuno Sky Prime's 6 mm.
  • Hoka Skyward X 2's heel stack is 48 mm, 1 mm thicker than Mizuno Sky Prime's 47 mm.
  • Hoka Skyward X 2's forefoot stack is 43 mm, 2 mm thicker than Mizuno Sky Prime's 41 mm.
  • Weight is about the same: 298 g for Hoka Skyward X 2, 295 g for Mizuno Sky Prime.
  • Toe rocker is about the same: 35 % of length for Hoka Skyward X 2, 32 % of length for Mizuno Sky Prime.

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:

Hoka Skyward X 2

Mizuno Sky Prime

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