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The Flex-Run with Nike Sole offers unmatched performance and efficiency for amputees and prosthetists. Össur and Nike have partnered to design the ideal running foot from the ground up, leveraging Össur’s unmatched expertise in running prosthetics with Nike’s world renowned traction and sole technologies.

The improved Flex-Run features a longer toe lever and efficient energy return. The Nike Sole offers great traction to help improve performance for the runner while improving efficiency and results for the prosthetist.

Flex-Run with Nike Sole is appropriate for Transfemoral and Transtibial users participating in high impact activities such as recreational jogging, trail running, distance running and triathlons. It is available in both Standard and Junior (LP) models.

Impact Levels

Impact LevelExample


Daily activities involving fast walking, jogging and climbing stairs.

Example: Heavy-lifting, manual labor, recreational sports.


Activities involving running, track and field, sprinting, and long-distance running.

Example: Track and field sports.



Active Tibial Progression

Full Length Toe Lever

More Sport Solutions

Flex-Run Specifications

Flex-Run™ Product Information
Warranty Information
Amputation Level:



Impact Level: High to Extreme
Maximum Patient Weight: 130kg
Categories: 1-9
Sizes: One Size Per Category
Weight Of Foot: 400g (14.1oz) 694g (24.4oz) with Sole and Male Pyramid
Build Height Standard: 261mm (10 1/4") 277mm (10 7/8") with Sole
Adapter Options: Male or Female Bolt-on Pyramid
Flex Foot Characteristics:

active tibial progression

full length toe lever

Special Order: For information on special or custom orders, please contact your local Össur representative.

Flex-Run™ Features

Active Tibial Progression

Active Tibial Progression

Vertical forces generated at heel contact are stored and translated into a linear motion described as Active Tibial Progression. This action reduces the need to actively push the body forward using the contralateral foot and also equalizes stride length.

Benefit: More natural gait and reduced walking effort.

Full Length Toe Lever

Full Length Toe Lever

The full length keel/toe lever matches the length of the sound foot, providing improved support to the prosthetic limb during late stance. It ensures that users spend equal time on the prosthetic foot and natural limb, thus providing improved walking dynamics and reduced impact to the sound limb.

Benefit: Improved walking symmetry and reduced impact to the sound limb.