Flax and hemp were once Europe's most important industrial crops, supplying fibre for linen, rope and sailcloth. Today engineers are rediscovering them as lightweight, strong raw materials for natural fibre composites in automotive interiors, construction and furniture. This article traces their journey from field to product: fibre structure, retting and processing, and the European partnership between Eve Reverse (NL) and FUSE Composite (DE) strengthening the bio-based value