Men's One 2.5 running shoes

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The One 2.5, Altra’s lowest profile neutral running shoe, is back with new colors and extra style. With only 23mm stack height, this do-it-all performance shoe keeps you close to the ground while still managing to be a favorite among passionate runners. The ultra light InnerFlex™ midsole provides impressive lightweight flexibility, while a weight-balanced Zero Drop™ platform helps maintain low-impact form, even when fatigue sets in at the end of hard race or workout. And with a FootShape™ toe box that allows your toes to spread out naturally for more stability and speed, you get a strong toe off to propel you further and faster.

What's new: Improved Fit, redesigned Upper, new Color Options.

• Designed to Improve: Running Form, Toe Splay, Stability, Comfort
• Platform: Fully Cushioned Zero Drop™ Platform, FootShape™ Toe Box
• Stack Height: 23 mm
• Midsole: Dual Layer EVA with A-Bound™ Top Layer, InnerFlex™ Technology
• Outsole: FootPod™ Technology
• Insole: 5 mm Contour Footbed
• Upper: Quick-Dry Air Mesh

• Sizing: 1/2 Size Short
• Weight: 6.3 oz.
• Cushioning: Light
• Ideal Uses: Running, Racing, Speed Work, Training, Walking

Zero Drop : Places your heel and forefoot the same distance from the ground to encourage natural, low-impact running form throughout your run.

Foot Shape : Allows toes to relax and spread out naturally and the big toe to remain in a straight position for more comfort, speed and stability.

Abound : Super lightweight EVA Foam combines with our energy-return compound to protect the feet at impact and adds a spring to each step.

Foot Pod Technology : Unique outsole and midsole pattern maps the bones and tendons of your foot to let it flex where it naturally wants to.

Innerflex : Grid-like flex grooves in the midsole allow your foot to flex where it needs to for more speed and improved performance.