A Perlon Strap is a semi-transparent watch band woven from fine nylon filaments in an open, ladder-like mesh rather than cut from a single flat strip. The material is a polyamide developed in Germany in the mid-twentieth century, and "perlon" began life as a registered trademark for that nylon. The most useful consequence of the open weave is simple: there are no fixed holes, so the buckle pin slides into the mesh wherever you want it, giving you precise micro-adjustment as your wrist swells and shrinks through the day. Light, breathable and quick to dry, Perlon spread across European sport and dive watches through the 1960s and 70s and still reads right on a vintage field or diver today.
The reference name here is Eulit, founded in Germany in 1924 and still weaving its straps in Bavaria. Eulit's Kristall is the finest braid in the line and keeps the strap thin and supple, while the two-piece Palma and Palma Pacific show a slightly coarser, more visible weave. Pricing stays refreshingly low: the Kristall runs around £17 and the two-piece Palma Pacific closer to £21, with most Eulit perlons landing between £15 and £22. If you want something dressier, Phenomenato builds made-to-order perlon with a denser HD Weave and 316L hardware, which means a real premium and a wait, but a more substantial strap in hand.
Your first real decision is single-pass versus two-piece. A single-pass perlon runs as one length under the caseback, keeps the profile thin, and crucially will keep the watch on your wrist if a spring bar lets go, which is why I reach for it on divers and daily beaters. Two-piece versions give a more conventional look. Because perlon is thin and flexible, it flatters smaller dress and field cases in the 36 to 40mm range and shines in hot weather; on a very heavy diver the woven ends can fray over time, so buy a strap with cleanly heat-sealed tips.
Who is it for? Anyone who wants to ditch a hot metal bracelet in summer, swim or sail without babying the watch, and still enjoy fine micro-adjustment will find a Perlon Strap a cheap, high-value upgrade. One caution: Erika's Originals MN straps are often lumped in with perlon, but they are elastic Marine Nationale weave, not classic woven perlon, so keep that distinction in mind when you shop.