X4.BKIV - Extreme performance sports glasses with ZEISS® Cat.4 lenses

X4 is the NRC sports eyewear designed for extreme conditions, where visual protection is essential. Designed for high mountains, high-altitude cycling and very bright environments , it offers superior performance without compromise.

The binocular structure (with two separate lenses) improves stability and visual precision, ensuring more controlled perception in bright light conditions. Designed and manufactured in Italy , X4 maintains the NRC philosophy: maximum functionality, zero compromise.

ZEISS® Category 4 nylon lenses (not polycarbonate) ensure extreme sun protection , ideal for high mountains and reflective environments. They offer up to +70% clarity of vision , –20% weight , are BPA-free , non-deformable and even outperform mineral glass. The certified ZEISS hydrophobic and oleophobic coating keeps vision clear even in the most severe conditions.

The adjustable nosepiece ensures a stable and precise fit during intense activity. Compatible with an internal optical clip for prescription lenses, the X4 is designed to truly adapt to the athlete.

X4 is the NRC choice for those who take the environment to the limit and demand protection, control and performance