6.1 oz / 173 g
- Fits true to size.
- Offers an extra wide toe box for increased volume.
- Airmesh upper for increased comfort and breathability.
- You may remove the insole to gain more volume by approx. ½ size.
- This model shares similar fit and ride characteristics with CORE. Size conversion chart
  • REALFIT™ last
  • 360-degree reflective mesh upper
  • Seamless reflective overlays
  • Reflective laces
  • Asymmetric lacing
  • Anti-slip heel cup
  • No-tongue design
  • IBR outsole
  • 0mm heel-to-toe differential
  • 11mm forefoot/11mm heel stack height


Hyper Reflectivity

The fully reflective accomplice to the lightweight PHASE, the PHASE-X is designed for runners who don't stop when the sun goes down. PHASE-X is the ultimate low-light running shoe, with 360-degree reflectivity. Safety, style and lightweight performance come together.

  • Lightweight, minimal and hyper reflective
  • Seamless (no-sew) upper reduces weight and minimizes hot-spots
  • Antimicrobial insole helps fight odor
  • Zero-drop construction lets the foot move naturally
  • Asymmetric, no-tongue design reduces pressures on top of foot
  • IBR outsole provides incredible ground feel without sacrificing protection


  • Pushing the boundaries of material technology, IBR (Injection Blown Rubber) offers better abrasion resistance, grip and compression-set than injected EVA, at a much lower density and weight than rubber. This provides runners with excellent groundfeel and outstanding durability, longevity and running comfort in a flexible, lightweight single unit.
  • GET SEEN! 360° Reflectivity provides amazing high visbility in low-light conditions thanks to fully reflective no-sew laminate overlays and a lightweight, breathable reflective mesh. Additional reflective details include reflective laces, logos and accents.