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Opal Regenwald 20 Jahre Jubiläum 4-fach is a premium German sock yarn celebrating 20 years of the famous Regenwald collection. Made from 75% virgin wool and 25% polyamide, this sustainable, high-quality yarn features unique self-patterning prints — from stripes and flames to Norwegian-inspired motifs. Perfect for socks, sweaters, scarves, and accessories that combine durability with creativity.