The honest answer to "which strap material is best?" is that none of them wins outright. Leather belongs at dinner and wilts at the pool; rubber thrives in water but reads as sporty with a suit; stainless steel endures for years but sits heavy on the wrist; NATO fabric is light, breathable, and quick-drying, yet can fray and never quite looks formal. What I offer here is a framework for choosing well: a close reading of each material's character, followed by a comparison table you can use to match a strap to your watch, your climate, and your calendar.
Leather Straps: Timeless Elegance and Craftsmanship
Leather is where most collectors begin, and for good reason. As TH Baker's Bijal Shah notes, it is a timeless choice that ranges "from sleek, dressy styles to rugged, vintage looks," in finishes including calfskin, alligator, and crocodile. Teddy Baldassarre's team agrees that leather straps "generally signify a watch worn in formal circumstances," soft to the touch, with tone-on-tone or contrast stitching binding their layers together.
Within the category, the upper reaches matter. Shell Cordovan, cut from the back side of a horse hide, goes through months of refining — around six at minimum — and, as Strapcode's Vienna Choy explains, is prized by luxury shoemakers before it ever reaches a strap maker. It carries Horween's distinctive, pleasant smell, the result of how the hides are processed. The trade-offs are real: leather is not great at resisting water, will eventually wear out and need replacement, and regular cleaning is what keeps it supple and prevents cracking. Alligator and crocodile are similarly sensitive to moisture and can dry or crack without careful maintenance. Leather is the connoisseur's choice for dress and traditional everyday watches — never for swimming.
Rubber Straps: Modern Durability for Active Lifestyles
For swimming, sport, and frequent water exposure, rubber is usually the most practical choice, and among rubbers, FKM is the one worth knowing. A fluoroelastomer that Strapcode describes as "vulcanized rubber on steroids," FKM offers excellent resistance to harsh chemicals and weather conditions, with durability the site calls extraordinary. It outperforms other rubber categories for dive watches, and rubber straps generally are a common pairing with them.
Comfort is rubber's quieter virtue. FKM is flexible and hypoallergenic, and silicone alternatives add strong temperature resistance for allergy-prone wearers. Still, rubber is not without compromise: some wearers find it less breathable than textile options in sustained heat, and certain designs attract lint. Aesthetically, it lives comfortably in the sports lane — a dive watch on FKM looks entirely at home; a dress watch on rubber reads as a deliberate, modern gesture. For hot climates, sweaty workouts, and any watch that regularly meets water, rubber earns its place without apology.
