The design of the air unit allows it to compress vertically while resisting lateral deformation, best running shoes for fartlek.

For natural running enthusiasts and gym-goers, this minimalist workout shoe is designed with you in mind. The newly updated ST-5 features a ZipFoam midsole and a reduced zero-drop platform, now just 14mm, providing a close-to-barefoot experience with enough cushioning for comfort.

Its sleek upper, made from recycled mesh, offers a secure, breathable fit. If you're looking for a minimal underfoot feel for running, gym sessions, or casual wear, the Topo Athletic ST-5 is the perfect choice.

• Anatomical toe box allows toes to spread naturally and comfortably.
• Best For: Daily Running, Gym & Training
• Stack Height: 14mm
• Heel to Toe Drop: 0MM
• Weight: 6.6 OZ (Size 9)
• Cushion: Low
• Performance: Responsive
• Support: Neutral
• For a '2nd Skin' fit and feel.
  

Ensures the midsole foam provides the correct balance of responsiveness and durability, used running shoes.