Dye i4 Mask - Powder BlueQuick lens change Multi way ventilation All round vision One of the slimmest and lightest masks, which also offers one of the best fields of vision on the market. The i4 is the ultimate in the long history of DYE mask technology. The clarity of vision through the thermal glass is unique in the industry and guarantees a field of vision without distortion or fogging of the lenses in any weather. The i4 system offers countless lens options for all