Seac M-30 Modular Freediving Fins

Seac M-30 Modular Freediving Fins are long-blade fins designed for freediving, spearfishing and underwater exploration where comfort, reactivity and efficient propulsion matter. Built with an interchangeable high-modulus technopolymer blade, they deliver a light, responsive kick that feels natural through extended sessions in the water. The M-30 foot pocket uses short side rails and a two-material construction to maximise blade response while staying comfortable with bare feet or thin socks. With a 30 degree blade angle and modular compatibility with SEAC BM-30 blades, these fins are a versatile platform for divers wanting performance that can grow with their technique. Seac M-30 Modular Freediving Fins Key Features & Technology Interchangeable Blade System: Modular blade design allows the fins to be upgraded or adapted, including compatibility with SEAC BM-30 blades. High-Modulus Technopolymer Blade: Lightweight and responsive blade material helps reduce weight while increasing elastic return during each kick. Long Freediving Blade: Designed to generate smooth, efficient propulsion for freediving, spearfishing and extended underwater sessions. 30 Degree Blade Angle: Optimised blade angle helps improve power transfer, reduce muscle fatigue and support a more natural finning motion. M-30 Foot Pocket: Two-material foot pocket is designed for comfort, energy transfer and secure connection to the blade. Short Side Rails: Short rail design helps improve blade reactivity and gives the fin a more responsive feel through the kick cycle. Barefoot or Thin Sock Comfort: Foot pocket is suitable for use with bare feet or thin neoprene socks, depending on fit and preference. Efficient Energy Transfer: Blade and foot pocket combination helps transfer power from the leg into forward movement with less wasted effort. Lightweight Performance: Reduced overall weight helps improve comfort during longer dives and repeated surface swims. Spearfishing & Freediving Ready: Built for apnea, spearfishing and recreational underwater use where efficiency and control are important. Upgrade-Friendly Platform: A strong starting point for divers who may later move into more structured, performance-focused blades. SEAC Made in Italy Quality: Produced by SEAC, a trusted diving brand with Italian design heritage dating back to 1971. Seac M-30 Modular Freediving Fins are a responsive and versatile fin option for divers wanting lightweight propulsion, modular blade flexibility and comfortable performance across freediving and spearfishing sessions.