Best Lightweight Trainers of 2025: Five Running Shoes Under 9 Ounces Worth a Look

Introduction

Lightweight trainers keep getting lighter, and the category has quietly split in two. Some of these shoes are featherweight and genuinely fast, while others are light but built more for comfort than speed. For this roundup, a hard cut-off of 9.0 oz (255 g) applies: every shoe here makes that mark, while anything heavier was left off.

The five picks below cover a wide range of what a lightweight trainer can be in 2025. There is a versatile pebax-blend all-rounder, a gravel-ready hybrid, a big-stack rocker shoe, an economy-focused daily trainer, and a plated racer-style option. Weights, stack heights, prices, and fit notes are laid out for each so you can match a shoe to how you actually run.

New Balance FuelCell Rebel v5

The New Balance FuelCell Rebel v5 is the least surprising entry on any lightweight list, and for good reason. It comes in at 7.6 oz with a FuelCell midsole that blends pebax into the foam, sitting at a middle-stack 35 mm in the heel and 29 mm in the forefoot for a 6 mm drop.

At this weight it is genuinely versatile: the foam is plush but bouncy, and the shoe has just enough flexibility to let you turn over with a natural feel. It is a bit of a Swiss Army knife, and among this group it is probably the fastest shoe of the lot. The trade-off is that it loses some versatility on longer efforts compared with the bigger shoes here, and it can feel slightly unstable for some runners. At $145 it is also solid value for what it delivers.

If you want something light and nimble that is still neutral and plush, and you care about going fast rather than grinding out long miles, the Rebel v5 is the pick.

Salomon AeroBlaze 3 Gravel

The Salomon AeroBlaze 3 Gravel is the sleeper of this group. At 8.7 oz it is surprisingly light given the outsole: a Contagrip gravel outsole adds traction and durability for dirt, trail, and off-road conditions. The midsole is supercritical TPU with a beaded feel, a little like Adidas Boost but lighter and livelier.

That beefed-up outsole adds a touch of stiffness, and it actually steadied the ride compared with the standard AeroBlaze 3, which felt a little unstable. The result is a shoe that works for easy running, picking up the pace, and everything in between, especially when a route goes from road to dirt to runnable trail.

Fit is a touch narrower than the Rebel v5: there is forefoot volume for swelling, but it is not the widest shoe out there. At $140 it is another strong value, particularly if you like a balanced neutral shoe that handles a bit of everything, including some off-road.

ASICS MegaBlast

The ASICS MegaBlast is a very surprising shoe, mostly because of how much shoe ASICS packed into 7.9 oz in a men’s size 9. The stack is 44 mm in the heel and 36 mm in the forefoot on an 8 mm drop platform, using the new Flight Foam Turbo Squared, an ATPU-based midsole it shares with the SonicBlast.

This is essentially a lightweight rocker shoe. The ATPU midsole feels like a step up in quality from some of the other foams here, but it is a lot of shoe, and some of the pop disappears at top speeds. That makes it an excellent easy-day to slightly uptempo option rather than a track weapon.

If you want a recreational marathon shoe, a long-run shoe, or a tempo-day companion, the MegaBlast makes a lot of sense. It is one of the more satisfying shoes of this group for long runs and easy days alike. It retails at $225.

Tier Maverick v1

The Tier Maverick v1 is the shoe whose secret is getting out. It was not expected to appear on a lightweight trainers list, yet it comes in at 7.7 oz with a wild 44 mm heel stack and 36 mm in the forefoot. Everything about the design targets one goal: improving running economy.

It uses a supercritical midsole, a very lightweight translucent mesh upper, and a thin rubber outsole that still grips well. The cushioning is resilient rather than mushy soft or super bouncy, and there is a bit of extra toe spring up front that makes you feel like you are constantly rounding forward into the next step. The result is a rhythmic shoe you can genuinely forget you are wearing.

It can go slightly uptempo, but it loses some pop as the pace rises, so it is best treated as an easy, rhythmic daily trainer. At $150 it is a very good price for what you get.

ASICS SonicBlast

The ASICS SonicBlast rounds out the list and is the most polarizing pick. It uses a dual-density midsole: Flight Foam Turbo Squared on top with a Blast Max layer underneath to temper the softness of the ATPU foam. In practice the ATPU runs a little firm, more compliant than the previous Flight Turbo but still on the firmer side, and the bottom layer does not feel strictly necessary.

It is a plated option with a pebax plate and very sharp toe spring. Specs: 9.0 oz, so it barely made the cut, with 46 mm of heel stack and 38 mm in the forefoot. The heel is the weak point for rear-foot strikers: it is not beveled especially well and can feel a bit like a shank on landing. But the midfoot and forefoot feel very good, with a lively, snappy, bouncy ride and plenty of stiffness up front. Alongside the Rebel v5, it is one of the two fastest shoes here. The upper is a lightweight jacquard mesh with a normal heel and midfoot fit and slightly wider, higher-volume forefoot.

Overall Buying Advice

If raw speed is the priority, the Rebel v5 and SonicBlast are the fastest shoes here, though the SonicBlast demands tolerance for a firm, clunky heel landing. For long runs and easy days with a big cushioned ride, the MegaBlast is the standout. The Tier Maverick v1 shines as a forgettable, rhythmic daily trainer, and the AeroBlaze 3 Gravel is the obvious choice if your routes mix road with dirt and gravel.

One honest note on coverage: the Saucony Endorphin Speed 5 is a popular shoe in this space, but it was not tested this year, so it is not included here. Fit matters too: the AeroBlaze 3 Gravel and SonicBlast lean narrower or roomier in different places, so check the fit notes above before committing.

Conclusion

The lightweight trainer category in 2025 is broader than ever, and these five shoes prove light does not have to mean fragile or uncomfortable. Whether you want a fast pebax-blend daily trainer, a gravel hybrid, a cushioned rocker, an economy-focused easy-day shoe, or a plated speed option under 9 oz, there is a clear pick here for each type of runner.