Spring Heel Straps (pair) Size:Longer Every component of FoldingFins™ —

Every component of FoldingFins™ — blade

Mono-material engineering eliminates the failure points of conventional fins: no glue joints

Saltwater-resistant

Pick by your boot size (cut varies by brand)

Engineered entirely from Hytrel® ECO B — a single advanced thermoplastic elastomer with up to 74% biomass content

Spring Heel Straps (pair) Size:Longer Every component of FoldingFins™ —Upgrade the fit of your FoldingFins with stainless steel spring heel straps. The coil spring holds constant, even tension across your boot a locked in fit that won't loosen as neoprene compresses at depth, with no mid dive adjusting. Saltwater resistant. Sold as a pair. Sizing: Shorter for boots EU 3642 Longer for EU 4348. Pick by your boot size (cut varies by brand), not your foot.