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The Vari-Flex with EVO provides an exclusive combination of comfort and dynamics.

The Vari-Flex with EVO is light-weight, easy to assemble and has a slender profile which makes it easy to cosmetically cover.

For users it ensures the highest levels of confidence and security. Offering natural gait with less fatigue and ultimately less strain on the lower back and sound side, it is the ideal foot for any activity.

The EVO feature enables users to experience natural gait progression by utilizing the foot plate to its fullest potential. A more natural gait reduces fatigue and puts less strain on the lower back and sound side.

Impact Levels

Impact LevelExample

Low Impact

Daily activities involving gentle, steady walking with the use of a walking aid.

Example: Moving around at home, modest walking in the community.

Moderate Impact

Daily activities involving average walking with the ability to vary speed or walking pattern.

Example: Going to the shops, confident outdoor walking.

High Impact

Daily activities involving fast walking, jogging and climbing stairs.

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


Impact LevelExample

Active Tibial Progression

CARBON-X® Active Heel


Full Length Toe Lever

Proportional Response

Split Toe



Note: Responsibility for accurate coding lies solely with the provider treating the patient. Össur assumes no responsibility or liability for the provider’s coding decisions. Össur’s coding suggestions rest on its best judgment and are subject to revision based on additional information or changes in the alpha-numeric system.

How far and how long people can walk comfortably has always been dependent on the amount of energy they use. Vari-Flex with the new EVO feature means optimal energy efficiency and less pressure and fatigue.

Ideal for most activity, Vari-Flex with EVO replicates the functions of the human foot beautifully. Its extra smooth roll-over motion contributes to a more natural, symmetrical gait, which means less fatigue and ultimately less strain on the lower back and sound side of the body.

8 out of 9 amputees who trialed the Vari-Flex with EVO said they preferred it to their previous foot. And 9 out of 10 reported a significant and positive difference when walking barefoot.
"On a scale of 0-5, I'd give it a 6!"

A big bonus for many people using this foot is the ease with which they can now walk barefoot. Most prosthetic feet are aligned for use with shoes, and removing them usually alters gait significantly. However in trials, users commented on improved stability in all types of situations, particularly when walking without shoes.

Who it is for:

  • People with all kinds of lifestyles / activity levels.
  • Those who are looking for a smoother roll over and energy-efficient gait.
  • People who weigh from 100-365lbs / 44-166kg.

The Technical Stuff

Made of specially layered carbon fiber for strength and functionality, the Vari-Flex with EVO is a lightweight, slender prosthetic that is easy to cover cosmetically. A durable, responsive foot, it has a split toe for enhanced stability. It is available in sizes 22-30cm and with a choice of beige or brown foot covers. A low profile Vari-Flex with EVO is also available for those with longer residual limbs.

More energy, less fatigue.

If you think the Vari-Flex with EVO could be right for you, discuss it as an option with your prosthetist.


Vari-Flex Specifications

Vari-Flex® Product Information
General Warranty Information
Amputation Level: Transfemoral,Transtibial
Impact Level: Low to High
Maximum Patient Weight: 166kg (365lbs)
Categories: 1-9
Sizes: 22-30
Weight Of Foot: 700g (24.7oz) w. Pyramid and Foot Cover
Build Height Standard: 170mm (6 11/16") w/ Pyramid and Foot Cover
Heel Height: 10mm and 19mm (3/8" and 3/4")
Adapter Options: Fixed Male Pyramid, Quick-AlignTM Male Pyramid or Carbon Tube
Flex Foot Characteristics: active tibial progression,carbon-x,evo,full length toe lever,proportional response,split toe

Vari-Flex® Features

Active Tibial Progression

Active Tibial Progression

Vertical forces generated at heel contact are stored and translated into a linearmotion described as Active Tibial Progression. This action reduces the need toactively push the body forward using the contralateral foot and also equalizesstride length.

Benefit: More natural gait and reduced walking effort.

CARBON-X® Active Heel

CARBON-X® Active Heel

The Carbon-X Active Heel stores the energy during loading response as the amputee transfers his or her body weight onto the prosthetic foot. Energyis gradually released from the heel providing optimal return for forwardprogression of the limb.

Benefit: Reducing impact to the joints and residual limb thus increases comfort, reduces joint and limb damage.



The EVO (Energy Vector Optimization) feature is generated by controlling how the ground reaction force is transferred to the prosthetic foot. Each step is optimized through the magnitude, placement and direction of forces for maximum efficiency. EVO enables the amputee to develop the most natural gait progression possible which reduces fatigue and puts less pressure on the sound side.

Benefits: Fluent roll-over which mimics natural gait progressionReduced fatigueEffortless control of the ankle during stance phaseLess pressure on the sound side Less pressure on the lower back

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.

Proportional Response

Proportional Response

The layering of carbon fibre, optimised through extensive computer analysis and mechanical testing, ensures that the deflection of the carbon fibre heel and forefoot components are proportional to the user’s weight and impact level.

Benefit: Customized construction optimizes walking efficiency thus reducing fatigue for the user.

Split Toe

Split Toe

A split toe feature allows the foot to adjust to uneven surfaces, allowing amputees to walk with stability and comfort on uneven ground.

Benefit: Helps to maintain balance, stability and reduces peak impact during loading.

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