Julbo Instinct Interchangeable Lens Sunglasses are supplied with
Spectron X5,
Spectron X6
Hi Contrast and
Clear Sight Lenses
Instinct Spectron X5 and X6 Polycarbonate Lenses are recommended for all sports for their shock-resistant and lightweight qualities.
Cat. 3 lenses (X5) transmit 8-18% and Cat. 4 lenses (X6) transmit 3-8% of visible light, making both these lenses suitable for bright light conditions including water sports and mountaineering.
Instinct Zebra Variable Lenses
Instinct Zebra NXT Lenses: high-definition vision; superior optical quality; optimum transparency; light and unbreakable; lasting strength and resistance to solvents.
Manufactured using low-temperature casting techniques which reduce internal stresses in the material improves the Zebra's optical quality, gives excellent transparency and increases long-term stability. NXT lenses were developed for the US Army.
The Zebra photochromic lenses give a wide amplitude in categories 2 to 4 with fast activation speed (22-28 seconds). The glass darkens or lightens as the surrounding brightness changes (from 40.7 to 6.6% of the visible light transmission rate depending on luminous intensity).
Cat. 2 transmits 18-43% of visible light and Cat. 4 transmits 3-8% of visible light. Zebra Lenses are anti-fog treated and are recommended for mountain biking, trails and climbing.
Instinct Zebra NXT Lenses: high-definition vision; superior optical quality; optimum transparency; light and unbreakable; lasting strength and resistance to solvents. 
