RADICAL 4
Weight : 920 g ( Ready to Fly Medium ) or 2190 g in M with the Airbag module
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Alpine Flight
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On-site flight
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Cross Country
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Hike and fly
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Two-seater
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Casual
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Regular
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Professional
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Beginner
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Intermediate
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Seasoned
Included Accessories
Speed bar
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.
A pioneering harness from hike & fly, the RADICAL—now in its fourth generation—is still just as at home in the mountains and on vertical slopes.
The RADICAL4 is an ultra-light string harness (920 g in size M) designed for mountain flying.
When used with its airbag pack option, it transforms into a harness equipped with airbag protection, an emergency pocket, and a reversible pack. This option makes it a versatile harness that offers safety on demand… and, above all, simplicity at every step.
Its sleek design reflects the philosophy behind its creation: keeping only the essentials to enhance the flying experience. Its featherlight weight in no way compromises itscomfort—thanks to its foam-padded back—or itsperformance in turns: the support is precise, cushioned (the independent, Mylar-reinforced “ leg straps ” smoothly smooth out air turbulence), and balanced (its structure eliminates unwanted movements).
The RADICAL4 provides “a sensation of smooth control and guided glide,” describes Yoann Chavanne, its designer. This soft precision while flying stems from its ability to deform to adapt to the pilot’s body.
Well-equipped (pole holders, removable waist belt), the RADICAL4 shines in its finishing touches. You can appreciate it at a glance: every practical detail, every meticulously crafted finish, every material chosen for its quality and durability. The structure of the harness and frame, along with the subgluteal airbag—repositioned in front of the harness and featuring a tube made of a high-strength material—were designed to enhance safety. The backpack and harness were designed separately to push technical and aesthetic solutions to their limits.
Freedom, lightness, simplicity—because when there’s nothing left to take away, what matters most remains.
Features
- Sitting position
- Mountain and progression flights
- Two-seater (pilot or passenger)
- No seatplates, but legstraps to gain weight
- Opening of the harness by the carabiners hooks
- Auto stability legstraps
- Parachute pre-installation (shoulder rescue straps, riser sheaths— reserve parachute —for prone and under-knee positions with airbag module)
- With the Airbag Bag: Airbag-style shock absorber, parachute-style pocket under the knee.
- Speed bar pulleys
- Backrest with support foam and comfort foam
- Semi-rigid ergonomic legstraps
- Patch pocket on the back (approx. 10 L)
- Pipette port for hydration at the top of the back pack
- Vario microphone clip on the 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
- EN 1651 Standard:Download the report
- LTF standard (with the RADICAL4 airbag module): download the report
This harness comes with the following accessories:
– Edelrid Pure Slider carabiners + locking clip
– speed bar (with the harness)
– Dyneema solo ascenders (with the reversible airbag pack)
– User manual
(Sold separately)
- RADICAL 4 Reversible, Removable Airbag Bag
- OLYS Abdominal Pouch
- Dyneema Solo Lifts
3D Model
Fun Ski Session with RADICAL4
RADICAL 4 - Technical Features
Do whatever you want
The RADICAL4 - EIKO2 Combo
RADICAL4 Takes Off
Hiking with RADICAL4
Technical Specifications
| S | M | L | |
|---|---|---|---|
| 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 shipped) (g) | 910 | 920 | 970 |
| Harness weight (with airbag module) (g) | 2160 | 2190 | 2260 |
| Maximum carrying capacity (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 5.3 L | 2.9 to 5.3 L | 2.9 to 5.3 L |
MEASURES:
SAFETY:
A - AIRBAG MODULE (OPTIONAL)
B - INTEGRATED CONTAINER RESCUE PARACHUTE
C - STORAGE POCKET
RADICAL 4 AIRBAG MODULE (OPTIONAL):
The airbag bag option allows you to convert your ultralight harness into a reversible harness equipped with a parachute pocket and a pre-formed airbag.
This module, which attaches to the harness with a zipper, provides both enhanced passive safety and greater versatility. All you have to do is attach or detach your airbag pack to adapt your harness to whatever activity you have planned for the day!
Gallery
Gallery
Downloads
Frequently Asked Questions About the RADICAL 4
An ultra-light 920 g harness (size M) without a seatplate, featuring semi-rigid “ leg straps .” It is designed for mountain flying and hike & fly.
This optional module attaches to the harness with a zipper. It includes a pre-formed airbag, an emergency pocket under the seat, and a reversible bag. With the module, the RADICAL 4 weighs 2.19 kg in size M.
Without the module, the harness is pre-equipped for a parasuit in a ventral position, such as the OLYS pocket. With the airbag pack, the reserve parachute is placed under the seat. The accepted volume ranges from 2.9 to 5.3 liters.
Size S: 160 to 175 cm and 50 to 70 kg. Size M: 170 to 185 cm and 65 to 90 kg. Size L: 180 to 205 cm and 70 to 120 kg.
It is certified to EN 1651 and LTF standards when used with the airbag. It can also be used as a two-seater, on either the pilot's or passenger's side.
When paired with a lightweight wing like the EIKO 2, it makes for a very lightweight setup for mountain flying and hike & fly.