The Cressi Fast 5mm is a modular semi-dry wetsuit consisting of three pieces: a 5 mm jumpsuit, an independent 5 mm hood, and a highly elastic 3.5 mm jacket. The modular system lets you adapt thermal protection to water temperature: jumpsuit only for 18–22 °C, or the full set for 14–18 °C. This flexibility makes it particularly useful for Patagonian diving or in Andean lakes where temperatures can drop below 15 °C.
Compared to its predecessor, the Castoro, the Fast improves on wrist and ankle seals using double-lined neoprene with an inner “Seal” ring for better water tightness — a chronic weak point in mid-range semi-dry suits. The wider back-zip flap and extended neck panel reduce water ingress when the head tilts forward, another common complaint with this suit class. The dorsal zipper is YKK® with an Acquastop® waterproofing seal. The 5 mm neoprene provides significant positive buoyancy: plan for approximately 1–2 kg extra weight compared to a 3 mm suit.
This is not an extreme cold-water suit: for regular dives below 12 °C, the Castoro 7mm or a thicker semi-dry is recommended. In Argentina, it is mainly available through Scubaires (Buenos Aires) and Cressi importers. As of May 2026, the Fast 5mm was available at Scubaires at approximately ARS 549,000.
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