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Under Armour Halo Racer

In production · road · Race day · $170

UA's rockered carbon racer for goal-race days.

Built for race day, at a target pace of 5:00–7:00 /mi on road.

The spec sheet

Weight
205 g / 7.2 oz
Heel stack
39 mm
Drop
8 mm
Plate
Carbon
Cushioning
4 / 5
Energy return
5 / 5
Responsiveness
5 / 5
Rocker
5 / 5
Flexibility
2 / 5
Stability
3 / 5 (5 = most guidance)
Toe-box
Standard
Sizing
Size up ½
Durability
~250 mi
Price
$170

How it rides

The foam

Under Armour tuned this midsole soft (4/5 on our cushioning scale). The foam is highly resilient — it gives energy back rather than swallowing it, which is what makes the shoe feel eager when you push. 39 mm of heel stack is the modern daily-trainer sweet spot — enough foam for long miles without losing contact with the road. Combined, the ride reads as explosive at 5/5 responsiveness.

The plate

A full-length carbon plate stiffens the forefoot and works with the foam as a lever: it smooths the transition off the toes and cuts the effort of holding fast paces. It also asks for speed — at easy paces a carbon plate feels stiff and does little for you, and it is the main reason super-shoes wear out sooner than trainers.

The geometry

A 8 mm drop is the mainstream middle — familiar to almost anyone coming from a standard trainer. The rocker is aggressive: the sole is curved and stiff enough to tip you into the next stride on its own, which saves the calf on long runs but feels strange when you slow right down. The forefoot is stiff, so it rolls rather than bends — a lever, not a slipper. Support is light — neutral, with a mildly steady platform.

Fit, sizing & life

The toe-box is standard width — comfortable for most feet without swimming. It runs small; most runners size up a half. Expect roughly 250 miles from the outsole, about $0.68 per mile at $170.

For the foams and plates Under Armour uses across its line, read the Under Armour 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

205 g / 7.2 oz

70 g lighter than the catalog median of 275 g

Heel stack

39 mm

3 mm taller than the catalog median of 36 mm

Drop

8 mm

2 mm higher than the catalog median of 6 mm

Price

$170

10 pricier than the catalog median of 160

Responsiveness

5 / 5

Catalog median 3 / 5

Cushioning

4 / 5

Catalog median 4 / 5

Energy return

5 / 5

Catalog median 3 / 5

Durability

~250 mi

Catalog median ~400 mi

Within the Under Armour line it is lighter than the brand's median (275 g / 9.7 oz) and sits taller than its median stack (36 mm).

Closest alternatives

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

Saucony Endorphin Pro 5

206 g / 7.3 oz · 40 mm · 8 mm drop · Carbon · $250

Carbon marathon racer with SPEEDROLL rocker geometry.

Brooks Hyperion Elite 4 PB(2023)

207 g / 7.3 oz · 40 mm · 8 mm drop · Carbon · $250

Brooks' marathon weapon: nitrogen-infused foam and a full carbon plate.

Puma Deviate Nitro Elite 3

209 g / 7.4 oz · 40 mm · 8 mm drop · Carbon · $250

One of the lightest marathon racers made — light enough to feel unfair.

Saucony Endorphin Pro 4(2024)

218 g / 7.7 oz · 40 mm · 8 mm drop · Carbon · $225

The approachable carbon racer: stable, smooth and forgiving at marathon effort.

Tracksmith Eliot Racer(2025)

218 g / 7.7 oz · 38 mm · 8 mm drop · Carbon · $280

Carbon-plated racer with a free-floating drop-in supercritical midsole and an understated silhouette.

Lineage & siblings