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Extremely low build height with a Carbon-X® Active Heel and alignment options.

The Flex-Symes foot design is a carbon foot module connected to an actively deflecting carbon heel. The improved alignment adapter now offers angulation and adjustments in ML / AP planes.

Flex-Symes is specifically designed for people with symes and pyrogoff amputations or transtibial users with long residual limbs.

Impact Levels

Impact LevelExample


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

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


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

Example: Going to the shops, confident outdoor walking.


Daily activities involving fast walking, jogging and climbing stairs.

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



CARBON-X® Active Heel

Full Length Toe Lever

Proportional Response

Split Toe



L5910 L5981

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.

Flex-Symes Specifications

Flex-Symes™ Product Information
Warranty Information
Amputation Level:


Impact Level: Low to High
Maximum Patient Weight: 166kg (365lbs)
Categories: 22-24; Cat. 1-6
27-30; Cat. 1-9
Sizes: 22-30
Weight Of Foot: 528g (18.6 oz) w. Foot Cover
Build Height Standard: 60mm (2 3/8") w. Foot Cover
Heel Height: 10mm (3/8")
Adapter Options: Direct Lamination Adapter
Flex Foot Characteristics:


full length toe lever

proportional response

split toe


Flex-Symes™ Features

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. Energy is gradually released from the heel providing optimal return for forward progression of the limb.

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

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 fiber, optimized through extensive computer analysis and mechanical testing, ensures that the deflection of the carbon fiber 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.



The use of first-rate material such as carbon fiber, titanium and high-grade aluminum provides permanent protection against harmful ingress of water. Even after submersion in water, the foot’s structural parts maintain their integrity and continue to provide full support, function and durability.

Benefit: No loss of prosthetic function under wet circumstances.