Topo Athletic
Ultrafly 6 Running Shoe – Women's
$144.95
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The Grivet Take
The Ultrafly 6 is Topo's mild-to-moderate stability daily, built around the brand's anatomical wide toe box paired with a foam medial post that now wraps around the heel for a smoother transition. The multi-density ZipFoam midsole reads cushioned on top with a firmer base for guidance, and the 32 mm heel stack absorbs daily-mileage impact well. Two trade-offs to flag: the foam reads soft and protective rather than responsive, and faster paces feel muted; and the medial post is mild and may not feel like enough structure for runners who specifically want a visible posted stability shoe. Runners who want a softer, plusher stability ride should look at the ASICS Gel-Kayano 32; runners who want a more traditional posted feel to the Brooks Adrenaline GTS 25 or NB 860v15.
Fit & Feel snapshot
Fit
LengthHow the shoe fits compared with true-to-size expectations.
True to size
Toe box widthHow much side-to-side room the shoe has across the front of the foot.5 of 5
NarrowWide
Toe box volumeHow much vertical room the shoe has above the toes.4 of 5
LowHigh
MidfootHow snug or roomy the shoe feels through the arch and laces.3 of 5
SnugRoomy
Heel holdHow securely the back of the shoe holds the heel.4 of 5
LooseLocked
Ride
CushionHow much material sits underfoot. This is about amount of cushioning, not how soft it feels.4 of 5
MinimalMaximal
SoftnessHow soft or firm the cushioning feels underfoot.3 of 5
FirmPlush
RockerHow much the shoe's shape rolls you forward through the step.3 of 5
FlatAggressive
ResponsivenessHow much pop or energy return the shoe feels like it gives back.2 of 5
DeadBouncy
Support
Support TypeSupport Type describes how much built-in guidance the shoe has. Neutral shoes do not add support structure. Stability shoes use geometry, rails, firmer foam, or frame designs to create a more guided feel. Motion control shoes are the maximum-support category and are rare in modern running.
Neutral
Stability
Motion Control
Guided stability
PlatformPlatform describes the width and shape of the shoe's base underfoot. A wider platform can feel steadier even when the shoe is neutral. This is separate from Support Type.
Wider, steadier base
How it fits
Length runs true to size for most runners. The toe box is anatomically wide with full toe splay and good vertical volume, Topo's signature geometry. Midfoot is moderate in volume with a stiff but flexible heel counter that locks the rearfoot in place; the redesigned heel-wrapping medial post adds containment without feeling rigid. Women's sizing is offered in B (standard) and D (wide); runners needing wider should look at the Topo Aura or a different model. Some customers report a scratchy inner toe guard against bare skin and prefer socks during running.
How it feels
The multi-density ZipFoam midsole reads softer on top and firmer underneath, a balance that protects the foot at impact while still feeling guided. The redesigned medial post that now wraps the heel makes the heel-to-toe transition smoother than the v5; the modest rocker geometry helps the foot transition through push-off. Cushion is moderate at the 32 mm stack, enough for daily mileage and long easy efforts but not in the max-cushion category. Responsiveness is on the lower side; the shoe handles easy and moderate paces well but flattens at tempo and faster efforts. The rubber outsole grips dry pavement reliably; coverage is targeted with foam exposed in low-wear zones.
Quick specs
- Category
- Long run trainer
- Surface
- Pavement · Treadmill
- Heel stackHow much shoe sits between your foot and the ground.
- 32.0 mm
- Forefoot stack
- 27.0 mm
- DropThe difference between heel height and forefoot height, measured in millimeters.
- 5.0 mm
- Weight (women's 7)
- 7.7 oz · 218 g
- CushionHow much material sits underfoot. This is about amount of cushioning, not how soft it feels.
- 4 / 5
- Support TypeSupport Type describes how much built-in guidance the shoe has. Neutral shoes do not add support structure. Stability shoes use geometry, rails, firmer foam, or frame designs to create a more guided feel. Motion control shoes are the maximum-support category and are rare in modern running.
- Stability
- PlatformPlatform describes the width and shape of the shoe's base underfoot. A wider platform can feel steadier even when the shoe is neutral. This is separate from Support Type.
- Wider, steadier base
- Midsole
- ZipFoam (multi-density: softer top / firmer bottom)
- Outsole
- Rubber
- PlateA stiff layer, usually carbon, nylon, or TPU, built into some shoes to add structure, snap, or propulsion.
- No
- WidthsThe width options this shoe is made in. Actual availability depends on current inventory.
- B · D
Tech, translated
ZipFoam in the Ultrafly 6 is a multi-density construction: a softer top layer for cushion and a firmer bottom layer for support and responsiveness. The multi-density geometry is Topo's approach to mild-to-moderate stability without using a rigid plate or aggressive sidewalls.
The medial post is a firmer foam region along the medial side of the midsole that resists compression where the foot tends to roll inward. On the v6, the post has been redesigned to wrap around the heel rather than running straight along the medial side, which gives heel-strikers a smoother containment feel at initial contact. The post is mild and reads less explicit than a traditional firm-post stability shoe.
The broad anatomical toe box is Topo's signature geometry: anatomically wide enough for full toe splay without the zero-drop transition of Altra. The Ultrafly 6 is the right combination of foot-shaped fit and stability features.
What changed from the previous version
The Ultrafly 6 adds 2 mm of stack at heel and forefoot to 32/27 mm, redesigns the medial post so it wraps around the heel for a smoother heel-to-toe transition, and refines the multi-density ZipFoam midsole for a softer cushion layer on top and a firmer responsive layer on the ground side. The breathable mesh upper and signature anatomical wide toe box carry over from the v5. Net effect: a touch more cushion, a more contained heel feel, and the same mild-to-moderate stability character; v5 customers will recognize the shoe.
Frequently asked
Does the Topo Ultrafly 6 run true to size?
The Ultrafly 6 runs true to size in length for most runners. The toe box is anatomically wide with full toe splay and good vertical volume, Topo's signature geometry. Midfoot is moderate in volume with a stiff but flexible heel counter; the redesigned heel-wrapping medial post adds containment without rigidity. Men's sizing is offered only in D (standard); runners needing wider should look at a different model.
What changed from the Topo Ultrafly 5 to the 6?
The Ultrafly 6 adds 2 mm of stack at heel and forefoot to 32/27 mm, redesigns the medial post so it now wraps around the heel for a smoother heel-to-toe transition, and refines the multi-density ZipFoam midsole for a softer cushion layer on top and a firmer responsive layer on the ground side. The signature anatomical wide toe box carries over from the v5. Net effect: a touch more cushion, a more contained heel feel, and the same mild-to-moderate stability character.
How does the Topo Ultrafly 6 compare to the Brooks Adrenaline GTS 25?
Both are moderate-stability daily trainers for everyday miles. The Ultrafly 6 has an anatomically wide foot-shaped toe box, a lower 5 mm drop, a 32/27 mm stack, and a heel-wrapping medial post. The Adrenaline GTS 25 has a more traditional fit, a higher 10 mm drop, Brooks's GuideRails along the sides, and a softer DNA Loft v3 midsole. Pick the Ultrafly 6 for toe splay and a lower drop; pick the Adrenaline for a softer step-in and traditional fit.
Is the Topo Ultrafly 6 firm or soft underfoot?
The Ultrafly 6 lands on the balanced side rather than soft. The multi-density ZipFoam midsole has a softer top layer for cushion and a firmer bottom layer for guidance; the overall feel is protective rather than plush. Energy return is moderate; the shoe handles easy and moderate paces well but flattens at faster efforts. Runners looking for a softer max-cushion stability ride should consider the ASICS Gel-Kayano 32 instead.
Is the Topo Ultrafly 6 good for treadmill running?
Yes. The multi-density ZipFoam cushioning, mild medial-post guidance, and rubber outsole grip belt surfaces reliably and absorb the steady cadence of treadmill sessions. The 5 mm drop and gradual rocker work smoothly at treadmill paces. Runners using the treadmill primarily for faster intervals should consider a lighter, more responsive shoe; the Ultrafly 6 is tuned for steady efforts rather than speed work.
Compare it toSimilar shoes or common alternatives, with the key fit and ride differences called out.
Brooks Adrenaline GTS 25
Choose the Ultrafly 6 for an anatomically wide toe box and a lower 5 mm drop. Choose the Adrenaline GTS 25 for Brooks's GuideRails along the sides with a higher 10 mm drop and a more traditional fit profile.
Compare Brooks Adrenaline GTS 25 →
ASICS Gel-Kayano 32
Choose the Ultrafly 6 for a firmer, lower-stack stability daily with an anatomical toe box. Choose the Gel-Kayano 32 for a plusher max-cushion stability ride and Asics's 4D Guidance System.
Compare ASICS Gel-Kayano 32 →
Saucony Guide 17
Choose the Ultrafly 6 for an anatomical wide toe box and a mild medial-post feel. Choose the Guide 17 for Saucony's center-path frame geometry and a softer overall ride.
Compare Saucony Guide 17 →
New Balance Fresh Foam X 860v15
Choose the Ultrafly 6 for an anatomical foot-shaped toe box at a 5 mm drop. Choose the 860v15 for NB's Stability Plane frame approach and a broader D-to-4E width range.
Compare New Balance Fresh Foam X 860v15 →
Buyer's guide
Read our stability vs neutral guide
How to tell which one you need, what's changed in modern stability design, and the brands that do each best.
Read the guide