RAIS glasses - exceptional all round! The raw material for the Substance Collection is beans from the Euphorbiaceae family. In powder form, it fulfils all technical requirements and impresses with its sustainability. Combined with the patented Rolf Flexlock hinge, the result is screwless, plant-based eyewear that is flexible, lightweight, durable and kind to the skin. The Austrian eyewear brand Rolf emphasises the use of natural materials and sustainable production without compromising on style and quality.