Go long in INOV8 TRAILFLY MAX. We’ve taken our popular TRAILFLY™ shoe and maxed it out with a generous slab of new FLYSPEED™ PRO foam for a comfortably cushioned yet naturally responsive ride – perfect for long distances and ultras over hard-packed trails.
The new supercritical, nitrogen-infused EVA foam is our highest performing to date. It’s super-lightweight, while giving both greater comfort and superior energy return. We’ve put 24mm of it in the heel and 18mm in the forefoot. This combines a 6mm deep, energy-popping BOOMERANG footbed for a bouncy feel that retains stability underfoot and plenty of agile ground feel.
The natural, foot-shaped design of the shoe – combined with the upper’s MET-CRADLE overlays – work to lock in at the heel and midfoot for confidence-boosting hold. The shape then widens at the toes, allowing them to spread, perform naturally, and increase that feeling of underfoot control, even on technical trails.
Hard-wearing, tacky rubber infused with the world’s strongest material – Graphene – covers the outsole. The 4mm long multi-directional lugs not only cut through loose trail and remain super-durable but also give improved grip in wet conditions. Underfoot flex grooves further enhance the agile, natural feel.
Highlights
- Ideal For Hard and Rocky Ground
- Graphene Enhanced Rubber Grip
- 6mm Drop
- BOOMERANG Footbed
- Suitable For Longer Runs and Ultramarathons
- Ultra Running
- Lugdepth – 4mm
- Midsole – Flyspeed
- Midsole Stack – 24mm Heel / 18mm Forefoot
- Sole Compound – G-GRIP Graphene Rubber
Technical Details
| Weight | 300g |
| Fit | Wide |
| Footbed | New, lighter BOOMERANG |
| Lugdepth | 4mm |
| Midsole | Flyspeed |
| Midsole Stack | 24mm Heel / 18mm Forefoot |
| Sole Compound | G-GRIP Graphene Rubber |
Size Guide
▸ How to measure your foot length
For the best fit, measure your foot at home before ordering. It takes 2 minutes.
On a hard floor, put a piece of paper against a wall.
Stand on the paper in your socks. Wear the type of socks you’d normally wear with this type of shoe.
Make sure your heel is against the wall and distribute weight evenly on your foot.
Ask someone to mark at the end of your longest toe. Repeat for both feet.
Measure the distance in mm. Pick your shoe size based on the length of your longer foot.
▸ Foot length chart
| UK size | Foot length (mm) |
|---|---|
| UK 3 | 216 |
| UK 3.5 | 220 |
| UK 4 | 225 |
| UK 4.5 | 229 |
| UK 5 | 233 |
| UK 5.5 | 237 |
| UK 6 | 242 |
| UK 6.5 | 246 |
| UK 7 | 250 |
| UK 7.5 | 254 |
| UK 8 | 259 |
| UK 8.5 | 263 |
| UK 9 | 267 |
| UK 9.5 | 271 |
| UK 10 | 275 |
| UK 10.5 | 279 |
| UK 11 | 284 |
| UK 11.5 | 288 |
| UK 12 | 292 |
| UK 13 | 301 |
| UK 14 | 305 |
▸ How to measure your foot width
Make sure you’ve measured the length of your foot first. You’ll need this measurement to work out the correct width.
On a hard floor, put a piece of paper against a wall.
Stand on the paper in your socks.
Make sure your heel is against the wall and distribute weight evenly.
Trace a line around your foot and mark the widest point.
Measure the distance and compare with the width chart. Choose the width based on your wider foot measurement.
▸ Foot width chart
| UK size | Precision fit (mm) | Standard fit (mm) | Wide fit (mm) |
|---|---|---|---|
| UK 3 | 80 | 85 | 90 |
| UK 3.5 | 80 | 85 | 90 |
| UK 4 | 82 | 87 | 92 |
| UK 4.5 | 82 | 87 | 92 |
| UK 5 | 84 | 89 | 94 |
| UK 5.5 | 86 | 91 | 96 |
| UK 6 | 86 | 91 | 96 |
| UK 6.5 | 88 | 93 | 98 |
| UK 7 | 88 | 93 | 98 |
| UK 7.5 | 90 | 95 | 100 |
| UK 8 | 90 | 95 | 100 |
| UK 8.5 | 93 | 98 | 103 |
| UK 9 | 93 | 98 | 103 |
| UK 9.5 | 95 | 100 | 105 |
| UK 10 | 95 | 100 | 105 |
| UK 10.5 | 97 | 102 | 107 |
| UK 11 | 97 | 102 | 107 |
| UK 11.5 | 99 | 104 | 109 |
| UK 12 | 99 | 104 | 109 |
| UK 13 | 102 | 107 | 112 |
| UK 14 | 102 | 107 | 112 |
Choose the width based on your wider foot measurement.
▸ Shoe fit options
Inov8 TrailFly Max comes in two fit options to suit different foot shapes and preferences.
Standard Fit — Narrower, snug fit that locks in at the heel and midfoot while widening at the toebox for natural toe splay. Best for narrow feet or runners who prefer a closer, more secure feel for maximum control and agility on technical terrain.
Wide Fit — Roomier toebox with more space for wider feet or extra comfort on longer distances when toes can swell. Provides greater wiggle room while maintaining the secure heel and midfoot lockdown.
Product Care
Warranty
INOV8 products come with a 12-month warranty
In the unlikely event of a fault of defect, all INOV8 products come with a 12-month warranty.
This warranty excludes:
- Normal wear and tear
- Misuse
- Accidental damage
- Issues caused by not following the products care instructions
Running Footwear
To maximise the life of your running shoes, make sure you dry them fully between runs. When dirty or muddy, clean your shoes to maintain the flexibility of the upper and its resistance to wear.
Washing:
For best results hand wash your shoes as close to the end of your run as possible. To wash your shoes:
- Remove the insoles and loosen or remove the laces.
- Brush off dried/caked mud using a soft brush.
- Rinse your shoes under cold running water while brushing off any remaining mud/debris (an old toothbrush is perfect for this).
Drying:
Place your shoes in a warm room, an airing cupboard or outside (but not in direct sunlight) to dry. Do not dry your shoes in a tumble drier or next to radiators, fireplaces or hot summer sunlight.
You can speed up the drying process by removing the shoe’s insole and shoelaces, and by stuffing them with newspaper.
Make sure your shoes are completely dry before wearing again.
RE-WATERPROOFING:
As with all water-repellent treatments, over time they begin to lose their effectiveness. To maintain your shoe’s waterproof finish, we recommend periodically re-waterproofing them using a product such as Grangers® Footwear Repel Plus.
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