Julbo Intensity Kilian Jornet REACTIV
Julbo Intensity Kilian Jornet REACTIV
In essence. Very light sports sunglasses (just 19 g) with a photochromic REACTIV 1–3 High Contrast lens that adjusts to the light automatically – from overcast weather to direct sun. The brown-pink tint lifts terrain contrast and the non-slip temples hold even on the descents. The photochromic coating carries a lifetime warranty, and the same model is worn by Kilian Jornet and Peter Fraňo.
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Julbo Intensity Kilian Jornet REACTIV – Photochromic sports sunglasses
See in any light, without feeling the weight
Julbo Intensity Kilian Jornet REACTIV are sports sunglasses built for trail running and mountain sports, where the light changes by the minute. The photochromic REACTIV 1–3 High Contrast lenses adapt to the conditions on their own – darkening in direct sun and lightening the moment you drop into forest or shade. At just 19 grams you barely feel them on your face. The model was developed with Kilian Jornet, and Peter Fraňo, currently Slovakia's best trail runner, races in the very same pair.
The essentials:
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Photochromic REACTIV 1–3 High Contrast lenses (13–72 % light transmission)
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Fast transition between bright and dark conditions
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Just 19 g – sunglasses you forget you're wearing
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Non-slip Grip Tech temples and nose pad that hold on the descents
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Front anti-fog ventilation and a lifetime warranty on the photochromic coating
Photochromic REACTIV 1–3 High Contrast lenses
They adapt to any conditions
REACTIV is Julbo's photochromic technology – the lens shifts its own tint depending on how much light there is. On an open ridge it darkens to category 3; in forest or shade it lightens to category 1 within seconds. One lens covers a whole day outside.
The High Contrast version has a brown-pink tint that lifts terrain contrast – you pick out roots and rocks more clearly, especially on fast descents. The lenses filter 100 % of UVA and UVB, and the photochromic coating carries a lifetime warranty.
Julbo Intensity – the lenses are Photochromic
shift their tint with the surrounding light
Julbo Intensity – photochromic category Category 1–3
covers overcast days through to direct sun
Peter Fraňo races in the Intensity Kilian Jornet
Proven by Slovakia's best trail runner
Peter Fraňo is currently Slovakia's best trail runner – winner of the 2025 Transvulcania Ultramarathon, bronze medallist at the 2023 Trail Running World Championships (80 km), winner of the 2022 Madeira Skyrace and runner-up at CCC by UTMB 2024. He races and trains in the mountains in the Intensity Kilian Jornet REACTIV.
Peter also offers coaching – individual training tailored to your fitness and racing goals. Stay ahead of injury, build fitness step by step and peak on time under the guidance of Slovakia's best trail runner.
Peter Fraňo's website→
Julbo Intensity – They sit and hold, even on descents
Fit and comfort
The Grip Tech temples have non-slip inserts that stay put through sweat and vibration – the glasses hold their place even on a fast, technical descent. The non-slip Grip nose pad holds just as reliably. The thin, flexible temples are designed so you can wear the glasses comfortably under a helmet too, and the inserts are built into the temples themselves so they don't catch your hair. The shape and cut of the lens channel airflow through the front ventilation to keep the lens from fogging. The wide panoramic lens also gives you an unobstructed view to the sides, so you read the terrain ahead more easily.
Julbo Intensity – 19 grams and a bio-based frame
Light and made in Europe
At just 19 grams, Intensity is among the lightest sports sunglasses in its class – on a long run you simply forget they're there. The frame is made of Rilsan, a bio-based plastic derived from the castor bean, so part of the construction comes from a renewable source rather than oil. The glasses are made in Europe, in Julbo's workshops in the Jura region of France.
Julbo Intensity Kilian Jornet details
More useful features
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High optical quality
Distortion-free lenses – the image stays sharp across the whole surface, right to the edges, so your eyes tire less over a long effort.
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Lifetime warranty on the photochromic coating
Julbo guarantees that the photochromic function will keep working for the lifetime of the glasses.
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Durability and lifespan
The robust lens and frame construction stands up to knocks, sweat and everyday use in demanding mountain environments.
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Versatile use
Trail running, uphill running, road and mountain biking, cross-country skiing – anywhere the light changes and you want one reliable pair of glasses.
Julbo Intensity Kilian Jornet REACTIV technical specification
Product parameters
| Lenses | |
| Technology | REACTIV photochromic |
| Lens type | REACTIV 1–3 High Contrast |
| Photochromic category |
1 – 3
Cat. 1 = forest, overcastCat. 3 = direct sun |
| Light transmission (VLT) | 13 % – 72 % |
| UV protection | 100 % UVA and UVB |
| Dark Brown / Light Brown | |
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Tint through the lens what you see when wearing them |
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Outer surface colour seen from outside in direct sun |
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| Frame | |
| Material | bio-based Rilsan (from the castor bean) |
| Origin | made in Europe (Jura, France) |
| Dimensions and weight | |
| Weight | 19 g |
| Face size |
M (Medium)
Built for an average-width adult face. The 136 mm frame width should roughly match the width of your face from temple to temple. If regular adult sunglasses fit you, this model will fit too – it's made in size M only.
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| Frame width | 136 mm |
| Bridge width | 14 mm |
| Temple length | 130 mm |
| Comfort and fit | |
| Temples | Grip Tech with non-slip inserts, thin and flexible, helmet-compatible |
| Nose pad | non-slip Grip nose pad |
| Ventilation | front anti-fog ventilation |
| Field of view | panoramic lens with a wide field of vision |
| Suitable activities | |
| Sports |
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