Julbo Slack Cover

The Slack Cover from Jura-based Julbo is a versatile pair of goggles for every occasion. Lightweight and extremely comfortable, these goggles feature a double-bridge frame with bold styling and proven reliability. Its removable shells on the sides and above the nose transform them into a vintage look of high-mountain exploration, while offering maximum protection.

Choice of glass

• Spectron: Lightweight, economical polycarbonate glass, available in a wide range of colours.


• Spectron HD: High-definition polycarbonate glass for improved clarity and contrast, with water-repellent treatment.


• Reactiv: A high-quality photochromic lens, its tint adapts to ambient light in 15 seconds. The lens covers several categories, from 1 to 3 for example.

Glass finish

• Polarized: Polarising filter that blocks the reflection of light on snow, ice or water (does not allow you to look at a phone screen, camera, etc.).


• Glare Control: Semi-polarising filter that partially blocks the reflection of light on snow, ice or water (screen compatible).


• Light Amplifier: Filter that amplifies brightness without compromising UV protection, for overcast skies, shaded areas...


• High Contrast: Filter that enhances contrast and accentuates relief, for good visibility of the terrain.

Glass category

• Cat. 0: Light tint filtering 0 to 19% of light, for night-time use.


• Cat. 1: Light tint filtering 20 to 57% of light, for low light, overcast skies. 


• Cat. 2: Average tint filtering 58 to 82% of light, in average, cloudless sunshine, except in summer.


• Cat. 3: Dark tint filters out 82 and 92% of light, the minimum recommended for sunglasses, and provides sufficient protection in strong light conditions (beach, sea, mountains...).


• Cat. 4: Very dark tint filters out up to 97% of light, for extreme conditions, high mountains on snow or ice.