Leto 40 Ariadna is pure power – 100% polyester silk, high tensile strength, and low elongation deliver even, secure seams where durability matters most. Perfect for footwear, furniture upholstery, outerwear, as well as leather and faux leather; also excellent for sewing on hook-and-loop fasteners and zipper tapes. Colourfast and chemical-resistant, it works without breakage and won’t pill. The neutral colour palette allows you to match the seam to the fabric or keep a subtle accent. A large 3000 m spool and recommended needles Nm 120–140 ensure long, trouble-free work. Choose Leto 40 at Berotex and sew without compromise.