Which should you buy?
Choose the Trailfly Zero V2 if you want the most nimble, grippy zero-drop shoe for muddy and technical trails.
Choose the Lone Peak 9+ if you want a cheaper, more cushioned zero-drop shoe for running and hiking.
The Trailfly Zero V2 is 25 g lighter than the Lone Peak 9+. It has 13 mm less foam under the heel. It costs £20 more at full price.
Side by side
| Spec | Trailfly Zero V2Inov8 | Lone Peak 9+Altra |
|---|---|---|
| Review score | Not enough reviews yet | 85/100 (1 review) |
| Type | Trail | Trail |
| Weight (men's UK 8.5) | 285 g | 310 g |
| Heel stack | 12 mm | 25 mm |
| Drop | 0 mm | 0 mm |
| Cushioning | Firm-ish | Balanced |
| Bounce | Calm | Calm |
| Plate | No plate | No plate |
| Support | Neutral | Neutral |
| Fit | True to size | True to size |
| Widths | standard, wide | standard, wide |
| Waterproof version | No | Altra Lone Peak 9+ GTX |
| UK RRP | £150 | £130 |
Weights are for a men's US 9 / UK 8.5. Prices are UK RRPs; shops often sell for less.
What the critics say
The reviews comparedReviewers praise both for roomy toe boxes and grip on mud and rock. Believe in the Run's John Calabrese and Brady Burman-Magday rated the Inov8 Trailfly Zero V2 among their favourite zero-drop shoes for its nimble ride. Treeline Review's Sam Schild and Mary Murphy rated the Altra Lone Peak 9+ their favourite Lone Peak, though thin cushioning left feet battered.
Trailfly Zero V2
- Nimble and light on mud, rocks and roots
- Grippy outsole with extra protection in wet conditions
- Comfortable fit with a roomy toe box
- Can feel short at first
- Expensive next to other zero-drop trail shoes
Lone Peak 9+
- Vibram Megagrip grips far better on wet rock and mud
- Wide toebox and good ground feel
- Comfortable straight out of the box
- Thin cushioning and no rock plate for long, rough days
- Heavier and better for hiking than fast running
Scores from RunRepeat.
Paraphrased from published reviews.
What's new in each
Altra Lone Peak 9+: The Vibram Megagrip version of the Lone Peak 9; RunRepeat measured it about 21 g heavier than the Lone Peak 8, torsionally stiffer and wider in the forefoot, with a slightly roomier toe box.
About each shoe
About the Trailfly Zero V2
Zero drop sets the Trailfly Zero V2 apart from the rest of Inov8's Trailfly series, which the brand builds for hard and rocky ground. Where the Trailfly V2 and Trailfly Speed V2 use a 6 mm or 4 mm drop, this shoe has a level 12 mm stack at heel and forefoot, plus a 6 mm BOOMERANG footbed. The Trailtalon Zero is the soft-ground equivalent, with deeper lugs.
The midsole is FLYSPEED PRO, which Inov8 calls a supercritical, nitrogen-infused foam. The outsole uses reformulated G-GRIP graphene rubber with 4 mm lugs, which the brand says gives 50% more slip resistance on wet surfaces. Inov8 pitches the shoe for speed, responsiveness and a natural, ground-connected feel in racing and faster training runs. It comes in Standard and Wide fits and is an updated version of the original Trailfly Zero.
Specs and features from inov8.com, compasspoint-online.co.uk and our own spec data. A factual overview, not a review.
About the Lone Peak 9+
Altra calls the Lone Peak the most popular shoe in its trail range, and the 9+ is the version with a Vibram Megagrip outsole in place of the standard Lone Peak 9's MaxTrac rubber. Altra lists it for trail running, hiking and thru-hiking. Underfoot sits an updated, lighter Altra EGO midsole with a StoneGuard layer for protection from rocks and debris, on a zero-drop, 25 mm stack.
The upper is 100% recycled ripstop mesh with no-sew overlays, which Altra says is designed for high-mileage durability, and a GaiterTrap hook-and-loop tab lets a strapless gaiter attach without fasteners. The Original FootShape fit is Altra's roomiest, and regular and wide (2E) widths are offered. Within the brand's trail range, the Timp 6 has a higher stack and the Olympus 7 is Altra's max-cushioned option, while the Lone Peak 9+ GTX adds a GORE-TEX Invisible Fit upper for wet weather.
Specs and features from altrarunning.com, altrarunning.com.au and our own spec data. A factual overview, not a review.
Trailfly Zero V2 vs Lone Peak 9+
In short
Two zero-drop trail shoes with roomy toe boxes. The Trailfly Zero V2 is 25 g lighter, lower and more nimble, and reviewers loved it on mud, rocks and roots. The Lone Peak 9+ is £20 cheaper with more foam underfoot and strong wet grip, and it doubles as a hiking shoe.
- LighterTrailfly Zero V2
- CheaperLone Peak 9+
- More foamLone Peak 9+
Get the full story
Inov8Everything on the Trailfly Zero V2What critics loved and didn't, fit and sizing advice, full specs and today's prices.Explore the Trailfly Zero V2
AltraEverything on the Lone Peak 9+3 video reviews, scores from 1 published review, what critics loved and didn't, fit and sizing advice, full specs and today's prices.Explore the Lone Peak 9+Still torn?
The shoe finder checks every current shoe against how you run and shows your two best matches.