# Supair RADICAL 4 – Ultralight Hike & Fly Harness - Link: https://paraglidingequipment.com/supair-radical-4-harness/ - Published: 2026-04-11T04:43:47-06:00 - Author: Benoist Bruneau **The Supair RADICAL 4 is the pioneer hike & fly harness, now in its fourth generation– light, flexible and made for the mountains.** The harness alone weighs just 920 g in size M. Add the optional airbag-backpack module and it becomes a lightweight reversible harness with airbag protection and an integrated reserve container. Light and compact, easy to set up and use, the RADICAL 4 adapts to your movements so you can play freely with the air – going fast, high and far. Its designer, Yoann Chavanne, describes “a feeling of smooth control”: the harness deforms slightly to follow the pilot’s body, giving soft, precise handling. ## RADICAL 4 at a glance * **Type:** ultralight open harness for hike & fly, ski flying and mountain flying * **Level:** novice to experienced pilots, occasional or regular flying * **Weight:** harness 910–970 g (S–L); with airbag module 2.16–2.26 kg * **Sizes:** S, M, L – pilots from 160 to 205 cm (5’3″–6’9″) * **Options:** harness only, harness + airbag-backpack module, or the module on its own * **Reserve:** integrated container for 2.9–5.3 L reserves (in the airbag module) * **Colors:** Petrol or Gold * **Certification:** EN 1651 (harness alone); LTF with the airbag module ## Choose your setup * **Harness only** – the lightest option for hike & fly and ski flying when every gram counts. No seat plate – just ergonomic, semi-rigid leg straps. * **Harness + airbag-backpack module** – zip on the module and the RADICAL 4 becomes a reversible harness with a pre-shaped airbag, an under-seat reserve container and a backpack for the walk up. * **Airbag module only** – already own a RADICAL 4? Add the module whenever you want. ## Watch the RADICAL 4 ![Supair RADICAL 4 – Do whatever you want](https://i.ytimg.com/vi/YaB9l5oZ8X0/hqdefault. jpg "Supair RADICAL 4 – Ultralight Hike & Fly Harness 1") ## Understanding your RADICAL 4 ### Ultralight and flexible The RADICAL 4 has no seat plate. Semi-rigid, ergonomic leg straps with independent Mylar stiffening support you in a seated position, and a foam-stiffened back adds comfort. The result is a harness that packs tiny and moves with you. ![Pilot flying the Supair RADICAL 4 harness above a snowy forest](https://paraglidingequipment. com/wp-content/uploads/2026/11/supair-radical-4-in-flight-snow-768x512.webp "Supair RADICAL 4 – Ultralight Hike & Fly Harness 2") ### The airbag-backpack module The optional module attaches with a zip. It adds a pre-shaped airbag, an integrated reserve container under the seat and turns the RADICAL 4 into a reversible backpack( 62 L in S/M, 67 L in L) – one bag for the hike and the flight. ![Two pilots hiking up with the Supair RADICAL 4 reversible backpack](https://paraglidingequipment. com/wp-content/uploads/2026/11/supair-radical-4-hike-and-fly-768x512.webp "Supair RADICAL 4 – Ultralight Hike & Fly Harness 3") ![Pilots carrying the Supair RADICAL 4 reversible backpack on a ski lift](https:// paraglidingequipment.com/wp-content/uploads/2026/11/supair-radical-4-ski-lift-768x512. webp "Supair RADICAL 4 – Ultralight Hike & Fly Harness 4") ### Features * Self-stabilizing leg straps * Pre-equipped for a reserve: shoulder rescue straps and riser sheath * Speed bar pulleys, pole holder and removable waist belt * About 10 L back pocket, hydration hose passage and vario mount on the right shoulder * Adjustable chest strap width, backrest angle and shoulder length * Edelrid Pure Slider carabiners included ## Frequently asked questions ### Do I need the airbag module? The harness alone is EN certified and is the lightest option for experienced pilots and ski flying. For extra passive safety, an integrated reserve container and a backpack, choose the harness with the airbag-backpack module (LTF certified). ### Which size should I choose? S fits 160–175 cm (5’3″–5’9″), M fits 170–185 cm (5’7″–6’1″) and L fits 180–205 cm (5’11″–6’9″). Check the weight ranges in the Specifications tab, or ask us: [ WhatsApp](https://wa.me/19173596449?text=Hi%2C%20I%20have%20a%20question%20about%20the%20Supair%20RADICAL%204)· [✉️ Email](https://paraglidingequipment.com/supair-radical-4-harness/info@letsgoparagliding.com?subject=Supair%20RADICAL%204%20question)· [📞 (917) 359-6449](https://paraglidingequipment.com/supair-radical-4-harness/+19173596449) ### Which reserve fits? Reserves from 2.9 to 5.3 L, in the container integrated into the airbag module. ### RADICAL 4 or ALTIRANDO LITE 2? The RADICAL 4 is lighter and more minimalist, with leg straps instead of a seat plate. The [ALTIRANDO LITE 2](https://paraglidingequipment.com/supair-altirando-lite-2-harness/) is a reversible harness with a seat plate and airbag as standard – more comfort for longer flights. ### Can I return or exchange the RADICAL 4? Harnesses are final sale, but you can exchange your RADICAL 4 for a different size. Ask for our free expert advice before you order: [ WhatsApp](https://wa.me/19173596449?text=Hi%2C%20I%20have%20a%20question%20about%20the%20Supair%20RADICAL%204)· [✉️ Email](https://paraglidingequipment.com/supair-radical-4-harness/info@letsgoparagliding.com?subject=Supair%20RADICAL%204%20question)· [📞 (917) 359-6449](https://paraglidingequipment.com/supair-radical-4-harness/+19173596449). See the Shipping & Returns tab for details. ### How long does delivery take? Supair usually has the RADICAL 4 in stock. We order yours as soon as your order is confirmed: import and customs clearance take 4–6 business days to reach our US warehouse, then 1–2 business days handling and **3–5 business days** standard delivery. Expedited orders are usually processed the same day – choose UPS Next Day Air at checkout. Tight deadline? [ WhatsApp](https://wa.me/19173596449?text=Hi%2C%20I%20have%20a%20question%20about%20the%20Supair%20RADICAL%204)· [✉️ Email](https://paraglidingequipment.com/supair-radical-4-harness/info@letsgoparagliding.com?subject=Supair%20RADICAL%204%20question)· [📞 (917) 359-6449](https://paraglidingequipment.com/supair-radical-4-harness/+19173596449)