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Altra Impulse

Discontinued · road · Tempo / Race day · $120

Early light stability-ish racer with a hint of guidance.

Built for tempo, race day, at a target pace of 6:15–8:30 /mi on road.

This model is no longer in production. The closest shoe you can buy today is Altra Vanish Pulse.

The spec sheet

Weight
215 g / 7.6 oz
Heel stack
23 mm
Drop
0 mm
Plate
—
Cushioning
2 / 5
Energy return
3 / 5
Responsiveness
3 / 5
Rocker
1 / 5
Flexibility
4 / 5
Stability
3 / 5 (5 = most guidance)
Toe-box
Wide
Sizing
True to size
Durability
~300 mi
Price
$120

How it rides

The foam

Altra tuned this midsole firm (2/5 on our cushioning scale). Energy return is moderate — comfortable and predictable rather than bouncy. 23 mm of heel stack keeps you low and connected, with more ground feel than most current trainers. Combined, the ride reads as lively at 3/5 responsiveness.

The plate

There is no plate here. The midsole does all the work, so the shoe flexes naturally and stays versatile across paces — easier on the feet day to day, but without the snap of a plated shoe when you want to roll.

The geometry

A 0 mm drop is close to level. That loads the calf and Achilles more than most runners are used to, so ease into it. The geometry is fairly traditional and flat, so the shoe follows your foot rather than steering it. The forefoot flexes easily, so the shoe adapts to slower, shorter strides. Support is light — neutral, with a mildly steady platform.

Fit, sizing & life

The toe-box is wide, with space for the toes to spread late in long runs. It fits true to size. Expect roughly 300 miles from the outsole, about $0.40 per mile at $120.

For the foams and plates Altra uses across its line, read the Altra brand guide.

How it compares

Measured against the 542 currently-available shoes in the catalog. The bar shows where this shoe sits in that range.

Weight

215 g / 7.6 oz

60 g lighter than the catalog median of 275 g

Heel stack

23 mm

13 mm lower than the catalog median of 36 mm

Drop

0 mm

6 mm lower than the catalog median of 6 mm

Price

$120

40 cheaper than the catalog median of 160

Responsiveness

3 / 5

Catalog median 3 / 5

Cushioning

2 / 5

Catalog median 4 / 5

Energy return

3 / 5

Catalog median 3 / 5

Durability

~300 mi

Catalog median ~400 mi

Within the Altra line it is lighter than the brand's median (294 g / 10.4 oz) and sits lower than its median stack (30 mm).

Closest alternatives

Current shoes with the nearest combination of weight, stack, drop, foam feel and plate.

Topo Athletic Fli-Lyte 6

210 g / 7.4 oz · 23 mm · 3 mm drop · — · $110

Low, nimble shoe balancing ground feel with a touch of cushion.

Topo Athletic ST-6

190 g / 6.7 oz · 18 mm · 0 mm drop · — · $125

Zero-drop, low-stack speed shoe for strides, track and gym work.

Altra Escalante 5(2025)

275 g / 9.7 oz · 24 mm · 0 mm drop · — · $140

Knit, flexible and natural — Altra's springy minimalist-leaning daily.

Saucony Kinvara 16

198 g / 7.0 oz · 29 mm · 4 mm drop · — · $140

Saucony Kinvara 16: 29 mm heel stack, 4 mm drop, 207 g — specs from independent lab testing.

Adidas Adizero RC 5

210 g / 7.4 oz · 28 mm · 8 mm drop · — · $90

Lightweight, firm budget racer for track work and 5Ks.

Lineage & siblings