Altra The 3-Sum 1.5 Women's Shoes Purple/Red

The Altra 3-Sum 1.5 is a zero-drop, natural triathlon racing shoe designed for a neutral foot motion.

Altra The 3-Sum 1.5 Wom Shoe Pur/Red 6.5 B
In Stock: 1
  • Size: Size 6.5    Width B    In Stock: 1
Altra The 3-Sum 1.5 Wom Shoe Pur/Red 8.5 B
In Stock: 1
  • Size: Size 8.5    Width B    In Stock: 1



The Altra 3-Sum 1.5 allows you to get the most out of your feet even with the fatigue of a swim and a bike. Designed to meet the needs of the competitive triathlete, this racing shoe features a zero drop platform to encourage an efficient stride, with enough cushion to keep your tired feet happy to the finish line. Featuring a seamless upper for sockless wear, and a quicklace system that allows you to fly through T2. An anatomical fit allows for toe splay without sacrificing security.

Model Number: A2424-1

Weight: 6.8 oz (size 8)

Stack Height: Heel (13mm), Forefoot (13mm)

Available Widths: B=Medium

How It Fits (based on width B)

  • Sizing: Standard running shoe length
  • Heel: Medium
  • Midfoot: Medium volume
  • Forefoot: Wide
  • Toe-Box Height: Medium
  • Arch Structure: Medium
  • Shoe Shape: Semi-Straight


The 3-Sum 1.5 is a minimum featured, minimum neutral shoe intended for training and racing.


  • A-Bound is a recycled, environmentally friendly midsole compound for resilient underfoot protection.


  • EVA midsole foam for durable cushioning.
  • Natural Ride System (NRS) design includes a more natural, foot-shaped last, zero millimeter heel to toe drop, and metatarsal-specific shapes in the outsole to assist in proper foot mechanics and allow for more natural foot movement.
  • Natural Foot Design follows the natural shape of the foot for ultimate comfort.


  • Quick Dry Air Mesh wicks water away from your foot while remaining light and breathable.
  • Support Insoles are 5mm-thick removable insoles designed for runners needing more traditional support and a molded arch.
  • Seamless Upper reduces irritation and provides next-to-foot comfort.
  • Pull Tabs allows for quick entry with a single-handed pull.
  • Asymmetrical Lacing Design follows the shape of the foot for improved fit and feel.
  • Strobel Last with the upper stitched to full length fabric for a comfortable underfoot feel.


  • SpeedPod Outsole follows the natural construction of the human foot for maximum flexibility and a responsive ride.
  • Blown Rubber offers lightweight traction, flexibility, and a responsive ride.
  • Drainage Holes in the heel and forefoot allow excess water to exit the shoe.

Footwear Performance Characteristics

Pronation Control: What's This?

  • Neutral
    • Min
    • Mod
  • Support
    • Min
    • Mod
    • Max
  • Motion Control
    • Mod
    • Max

Heel-Toe Offset (mm): What's This?

  • 0
  • 1-2
  • 3-4
  • 5-6
  • 7-8
  • 9-10
  • 11+

Stack Height:

  • Barefoot
  • Minimal
  • Low
  • Medium
  • High
  • Maximal


  • Road
  • Road-Trail
  • Hard Trail
  • Varied Trail
  • Soft Trail

Shoe Type:

  • Premium
  • Standard
  • Performance
  • Racing

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