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Pro-Flex® XC Torsion

Pro-Flex® XC Torsion


Pro-Flex XC has been developed to comfortably support the active user who enjoys hiking and jogging, as well as level-ground walking. Pro-Flex XC Torsion combines the Pro-Flex XC features of energy return and smooth roll-over, with valuable shock absorption and rotational capabilities. The sole blade offers a effective full-length toe, and a wider foot blade than traditional feet.

The foot is ideal for active users who want to use a single, lightweight foot for their normal daily life, as well as a range of higher impact activities.

Less load and more dynamics means that amputees can enjoy greater comfort in a wide range of activities. The well-designed and lightweight anatomical foot cover features a steady-grip sole for barefoot stability on wet or slick surfaces, and a sandal-clamping toe for a range of footwear including flip flops.

Össur recommends using Pro-Flex XC Torsion together with the Unity sleeveless vacuum suspension system. This adds minimal weight, no extra build height, and does not interfere with the Pro-Flex XC Torsion dynamics. Unity is designed to provide secure suspension in combination with Iceross Seal-In® technology, while stabilizing volume fluctuations and maintaining comfortable socket fit throughout the day.

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.

More Dynamic Solutions

More Feet

Pro-Flex XC Torsion Specifications

Pro-Flex® XC Torsion Product Information
Amputation Level:



Impact Level: Low to High
Build Height: 222 mm (8 3/4") w/ Foot Cover and Sock
Categories: 1-8
Sizes: 22-30
Weight Of Foot: 1035 g (2.28 lbs) w/ Foot Cover and Sock
Heel Height: 10 mm (3/8")
Adapter Options: Male Pyramid
Maximum Vacuum: -23inHg (-600mmHg)
Normal Operating Pressure: -16-20 inHg
Added System Weight: 75g (0.17 lbs) w/ Pump, Socket Valve and Tube

Unity® - Sleeveless Vacuum Suspension

Unity offers the security and freedom of vacuum suspension, but without the sensation and restrictions of a sleeve. This advanced system from Össur effectively addresses volume fluctuation and is totally compatible with Flex-Foot technology.

Key advantages

  • No sleeve required: Greater mobility and user acceptance
  • 15-22 in Hg Vacuum: Effective volume stabilization
  • Simple design: Quick and easy to achieve/release vacuum
  • Independent pump: Foot function uncompromised
  • Light weight: Complete system weighs only 130g

Unity for all

With the Unity Vacuum System by Össur, there is finally an elevated vacuum system for all users. Whether an above-knee or below-knee, low active or high active, mechanical or microprocessor solution is required, the Unity Vacuum System offers the flexibility to combine a variety of Össur feet and knees to achieve the optimal combination of equipment for each unique user.

Unity is only recommended with sleeveless Seal-In technology 

Unity® Product Information
Amputation Level:
Impact Level: All
Foot Sizes For Unity: See Relevant Foot Specifications
Maximum Vacuum: -23inHg (600mmHg)
Normal Operating Pressure: -16-20 InHg
Added System Weight: 130g W/ Pump, Socket Valve And Tube
Foot sizes See relevant foot specifications
Unity® Order Form