Light and flexible harness for hike and fly
Particularly adapted for your mountain and walking flights and flight, the Radical 4 is a light reversible harness with a removable airbag (OPTIONAL), including a rescue parachute integrated in the airbag module.

Weight : 920 g ( Ready to Fly Medium ) or 2190 g in M with the Airbag module

From 500,00

Recommended retail price in France
  • On-site flight
  • Cross Country
  • Hike and fly
  • Tandem
  • Occasional
  • Regular
  • Professional
  • Novice
  • Intermediate
  • Seasoned
Accessories included

Speed bar

Complementary product
Harness RADICAL4 in Flight
Backpack-Radical4 airbag

About the RADICAL 4

Light and compact, easy to install and use , listening to your movements to allow the pilot to play freely, to go faster, higher and further.

harness Pioneer of the walk and flight, the RADICAL, in its fourth generation, still loves the mountains and vertical slopes.

The RADICAL4 is anultra-light harness string(920g in size M) designed for the flight mountain.

When used with its airbag option, it becomes a harness equipped with an airbag protection, a rescue pocket and a reversible bag. This option makes it a versatile harness for safety on demand... and simplicity at every step.

Its pure design expresses the spirit in which it was conceived: to keep only the essential to magnify the experience in flight. Its light weight does not take anything away from its comfort, thanks to its foamed back, nor from its efficiency in the turns: the support is precise, damped (the independent legstraps , stiffened with mylar, gums up the irregularities of the air mass) and balanced (its structure cleans up the parasite movements).
The RADICAL4 gives "a feeling of smooth control, of controlled glide", describes Yoann Chavanne, its designer. This soft precision in driving is explained by its capacity to deform itself to adapt to the pilot's body.

Well accessorized (pole holder, removable waist belt) the RADICAL4 reveals itself in its finishing details. You can touch it with your eyes: every useful detail, every worked finish, every material chosen for its nobility and durability. The structure of the Strap and the frame, the subcutaneous airbag repositioned in front of the harness and using a Rush designed with a resistant material, have been thought to improve safety. The backpack and the harness have been designed separately to push the technical and aesthetic solutions to their limits.

Freedom, lightness, simplicity, because when there is nothing left to remove, the important thing remains.

harness modular ultra-light for hike flight  RADICAL4


  • Sitting position
  • Mountain and progression flights
  • Tandem pilot or passenger
  • No seatplates, but legstraps to gain weight
  • Opening of the harness by the carabiners hooks
  • Auto stability legstraps
  • Pre-equipment for parachute (shoulder rescue straps, riser sheath rescue parachute belly and subcutaneous position with airbag module)
  • With the Airbag: Protection airbag type shock absorber, subcutaneous parachute pocket.
Equipment / Comfort
  • Speed bar pulleys
  • Back with stiffening and comfort foam
  • Semi-rigid ergonomic legstraps
  • Plated back pocket (approx. 10 L)
  • Hydration pipette passage at the top of the back pocket
  • Vario microphone attachment on right shoulder
  • Belly spread adjustment
  • Backrest tilt adjustment
  • Shoulder length adjustment
  • Dyneema and polyester strap
  • 210D Ripstop nylon and 70D Diamond ripstop nylon
  • Skytex Nylon

This harness comes with the following accessories:

- Carabiners Edelrid Pure Slider + locking clip
- speed bar (with harness)
- Dyneema solo risers (with reversible airbag)
- Instruction manualUse


(Sold separately)

  • Reversible airbag RADICAL 4
  • OLYS para belly pocket
  • Dyneema solo risers

3D model

Ski fun session with RADICAL4

Video miniature of Ski fun session with RADICAL4

RADICAL 4 - Technical Features

harness radical 4 in flight

Do whatever you want

Click to launch the video: Everything is possible with the RADICAL4

The RADICAL4 - EIKO2 combo

Radical 4 and Eiko2 lightweight mountain gear

RADICAL4 at take-off

click to launch the video "Radical4 at takeoff

Hiking with RADICAL4

Radical4 and its reversible bag module

Technical Data

Pilot height (cm) 160 - 175 170 - 185 180 - 205
Pilot weight (min - max) (kg) 50 - 70 65 - 90 70 - 120
Weight of the harness (as delivered) (g) 910 920 970
Weight of the harness (with Airbag module) (g) 2160 2190 2260
Maximum carrying volume(L) 62 62 67
Back height (cm) 62 65 70
Height of backrest tilt adjustment (cm) 30 33 36
Depth of Seat (cm) 42 42 44
Height of attachment points (cm) 45 45 47
Distance between attachment points (cm) 33 - 44 33 - 44 34-48
Permissible parachute volume (L) 2.9 to 5.3L 2.9 to 5.3L 2.9 to 5.3L


Figure of RADICAL 4's dimensions



Figure of the RADICAL4 structure


The airbag option allows you to transform your harness ultra-light into areversible harness equipped with a parachute pocket and a pre-shaped airbag.

This module that connects to the harness with the help of a Zipper allows you to gain in passive safety as well as in versatility. You only have to attach or detach your airbag to adapt your harness to the practice you plan to do every day!

Option RADICAL4 Airbag Module




Radical4 with Airbag module in flight
RADICAL 4 on ground without airbag module
Inflating with the Radical4
EVEREST 3 Harness
Focus on the RADICAL4 without airbag module
Photo radical 4 in flight
Harness RADICAL4 in Flight
RADICAL 4 reversible backpack version
RADICAL4 reversible backpack module
Photo of the RADICAL4 in flight


User's manual



Radical4 with Airbag module in flight
RADICAL4 Reversible airbag module