Description of Julbo Dolgan Large Sunglasses - Soft Black / Spectron X4 This Dolgan model was created to fit larger heads and facial features. A versatile, lightweight mountaineering sunglass, it integrates high quality protection and current style. Features: Lenses: available with the mountaineering-specific Spectron 4 lens. Protection: removable side shields HCD Concept: highwrap lens geometry for an extra-wide field of vision.