IDC® Duo-Flex® Powerharness – a Unique Innovation of 2017 from JULIUS-K9®

The Duo-Flex® is the first dog harness in the world with a flexible chest strap,

developed to lessen the strain on the Owner’s arm while still providing great comfort for the dog.

The repeated tugging and jolting from leash holding while out walking the dog can cause joint pain and strain injuries to the Owner. The Duo-Flex® Powerharness has a flexible chest strap built in to the harness which is held tightly to the dog’s chest, helping to follow the movement of the dog more closely and ultimately reducing the pull on the leash, providing a safer and more comfortable experience. The flexible chest strap of our new invention follows every minor movement of the dog and the leash, while reducing the negative effects caused by micro-vibrations.

Improvements of the IDC® Duo-Flex® Powerharness

The elastic chest strap design eliminates the adverse effects caused by micro-vibrations (HAVS).

The chest pad and the chest strap close fitted on the dog’s chest provide a safer and more comfortable user-experience.

DUO-FLEX® = A further development of the well-known IDC® dog harness (2010)

  1. Reflective, tricoloured edging
  2. Edges and side patches which glow in the dark
  3. Breathable lining, water- and moisture-repellent inner foam
  4. Water-repellent outer materials
  5. The buckle is unbreakable down to -30 °C
  6. Elastic handle closure and torch holder elements (from size 0 to size 3)
  7. Replaceable DUO-FLEX® chest pad
  8. Fully replaceable chest strap
  9. A hook & loop fastener patch field on the chest strap
  10. DUO-FLEX® elastic portions on both sides of the chest strap to dampen the micro-vibrations

Special thanks to those doctors who in researching and treating Raynaud’s syndrome, Carpal tunnel syndrome and diseases involving inflammation of the tendons, provided indispensable support for the development of the Duo-Flex® dog harness.

more infos

Interchangeable Patch System from the Inventor

Choose the original patches directly from the inventor! Our new Duo-Flex® Powerharness comes with the popular standard interchangeable patch system, well-liked from our former models. You can choose from more than a thousand different patches from stock. They can be funny, can refer to the nature of the dog, or can be a distinguishing mark for working dogs. POLICE, RESCUE, BOXER POWER, etc.

If you do not find the proper side patches in our stock, you can order unique one as well.

Tested Quality

Our harnesses are subject to a regular, independent, certified quality test (Crash test), and achieved a tensile strength of 300 kg. At this strength only the buckle opened, but the harness did not break.

Closable Handle

The handle on the harness is useful during off-leash walks and allows us to grab the dog quickly and securely. One improvement is that it can be closed down with the D-ring and fixed to the top of the harness. Therefore, we can prevent our dog from getting caught up in branches, twigs or other protruding objects.

Side Bag Attachment Option

Side bags are available in different sizes and colours. They are excellent for carrying all personal documents, mobile phones or treats while walking the dog or going on an excursion. They can be attached quickly and easily due to hook and loop fasteners on the side bags and the harness.

Breathable, Skin-friendly Lining

The materials used by Julius-K9® do NOT contain any irritants. They only contain gentle, skin- and fur-friendly ingredients. For the inner linings we use the widely recognized, well-liked OEKO-TEX® material and it is also applied in the production of human grade products.

Technical information

Size chart

Harness sizeChest circumferenceWeight of the dog
058 - 76 cm / 23 - 30 in14 - 25 kg / 31 - 55 lbs
163 - 85 cm / 26 - 33.5 in 23 - 30 kg / 50,5 - 66 lbs
271 - 96 cm / 28 - 37.5 in28 - 40 kg / 61,5 - 88 lbs
382 - 115 cm / 32.5 - 46.5 in 40 - 70 kg / 88 - 154 lbs
496 - 138 cm / 38 - 54.5 in70 - 90 kg / 154 - 198 lbs

Product code:

16IDC-DUO-[color code]-[size]

  1. basic code to IDC® Duo-Flex harnesses: 16IDC-DUO
  2. after a hyphen the color code (e.g. red = R)
  3. after a hyphen the size code (e.g. size 1 = 1)

For example: IDC® Duo-Flex® harness, red, size 1: 16IDC-R-1

Available colors:

Washing and storage instructions

Do not Machine wash! Hand wash. Maximum temperature 40°C or 105°F. Wash separately!


  • hand_wash Hand wash
  • do_not_bleach Do not bleach
  • do_not_iron Do not iron
  • do_not_dry_clean Do not dry clean
  • do_not_tumble_dry Do not tumble dry

Patent office registration number


Product test

The quality control of the materials and of the products is made by