Short answer
The Saucony Xodus Ultra 4 is a dependable ultra-marathon workhorse built on a standard medium last that runs true to size (TTS) in length, yet presents unique anatomical challenges. Its architectural layout features a tapered toe box that delivers a highly snug and locked-in feel through the forefoot.
Runs true to size
Cross-sizing: what size to buy
Find a shoe you already own and read across to the Saucony Xodus Ultra 4 size to buy.
| Reference Shoe | US | EU | ||
|---|---|---|---|---|
| Your usual | Buy | Your usual | Buy | |
| Hoka Speedgoat 6 | 10.0 | 10.0 (or 9.5 for strict length) | 44 | 44 (or 43.5 for strict length) |
| Brooks Cascadia 19 | 10.0 | 10.0 | 44 | 44 |
| Saucony Peregrine 15 | 10.0 | 10.0 | 44 | 44 |
| Topo Athletic Ultraventure 4 | 10.0 | 10.0 (or 10.5 for wide feet) | 44 | 44 (or 44.5 for wide feet) |
-
Hoka Speedgoat 6
Your usual Buy US 10.0 10.0 (or 9.5 for strict length) EU 44 44 (or 43.5 for strict length) -
Brooks Cascadia 19
Your usual Buy US 10.0 10.0 EU 44 44 -
Saucony Peregrine 15
Your usual Buy US 10.0 10.0 EU 44 44 -
Topo Athletic Ultraventure 4
Your usual Buy US 10.0 10.0 (or 10.5 for wide feet) EU 44 44 (or 44.5 for wide feet)
Fit Notes
- Hoka Speedgoat 6
- Saucony's last is physically longer than Hoka's shorter last, meaning a standard US 10/EU 44 in Hoka provides an equivalent length to a US 9.5/EU 43.5 in Saucony. However, because both models share a snug midfoot profile, runners looking to accommodate ultra-distance swelling generally choose to remain at a US 10.0/EU 44 in the Xodus Ultra 4 to maintain crucial forefoot wiggle room.
- Brooks Cascadia 19
- Brooks and Saucony share an identical standard length last, allowing for a seamless 1:1 size transition. The key variance lies in width accommodation: the Cascadia 19 offers a more relaxed midfoot and optional wide (2E) sizing, whereas the Xodus Ultra 4 features a tapered lateral toe box and is strictly limited to standard medium widths.
- Saucony Peregrine 15
- This direct, in-brand comparison offers a perfect baseline sizing translation. While the sizing is identical, the Peregrine 15 uses a narrower, more aggressive last built for short-distance agility. The Xodus Ultra 4 delivers a marginally wider toe box and a significantly higher stack height designed for comfort over extended trail efforts.
- Topo Athletic Ultraventure 4
- Both models possess an identical physical length profile, but Topo Athletic utilizes an anatomical, foot-shaped toe box built for natural toe splay. When moving from Topo's spacious forefoot to the tapered lateral silhouette of the Xodus Ultra 4, runners often need to size up by a half-size to compensate for the narrower fit and avoid lateral pinky-toe friction.
Sizing FAQ
Does the Saucony Xodus Ultra 4 run true to size?
The Saucony Xodus Ultra 4 runs true to size (TTS) in standard length, sharing an identical sizing matrix with Brooks and Altra. However, because the shoe is designed for ultra-marathons where foot swelling is expected, many runners prefer to go up a half-size. This adjustment provides necessary volume as the foot expands over long hours on the trail. If transitioning from brands that typically run short—such as Hoka, New Balance, or La Sportiva—runners should select a half-size smaller in Saucony to maintain a consistent length.
Is the Saucony Xodus Ultra 4 good for wide feet?
The Saucony Xodus Ultra 4 is not recommended for runners with wide feet. The shoe is built on a standard medium last and is not offered in dedicated wide widths. While the midfoot width is relatively accommodating at 96.6 mm, the toe box tapers sharply to 71.6 mm and has a shallow vertical height of 24.5 mm. This tapered forefoot causes the outer toes to rub against the upper, and the rigid protective toe bumper can cause painful friction on the big toe. Wide-footed runners should consider wider, foot-shaped alternatives such as the Topo Athletic Ultraventure 4 or the Nike Zegama 2.
How is the arch support on the Saucony Xodus Ultra 4?
The Saucony Xodus Ultra 4 provides neutral but highly stable underfoot support. This is achieved through its dual-density midsole, which places a soft, energetic PWRRUN PB core inside a firmer, protective PWRRUN EVA carrier frame. The firm outer frame extends upward around the sides of the foot, acting as a supportive cradle that limits lateral and medial rolling on uneven trail surfaces. While it does not feature a traditional post for severe overpronation, this design provides reliable, structured support that keeps the feet and joints comfortable over ultra distances.
Specs & Sizing
| Weight | 309 g |
|---|---|
| Retail price | $170 |
| Price on Amazon | $160 - $170 |
| Release year | 2025 |
| Upper | High-strength engineered mesh with reinforcements in high-abrasion zones, gusseted tongue, and debris protection |
| Midsole | Dual-density with PWRRUN PB core for bounce and PWRRUN frame for stability and protection; PWRRUN+ sockliner |
| Outsole | Full-coverage Vibram MegaGrip with 4mm lugs for superior traction |
| Technologies | PWRRUN PB, PWRRUN, Vibram MegaGrip, PWRRUN+ sockliner |
| Fit & sizing | True to size; consider half size down if coming from brands like Hoka or New Balance |