Santi BZ420X

SANTI BZ420X undersuit for cold-water drysuit diving

SANTI BZ420X is a very warm technical undersuit designed for divers who need reliable insulation under a drysuit in demanding cold-water conditions. It is the newer, warmer evolution of the well-known BZ400X and is built for long dives, decompression dives and intensive diving in low water temperatures.

The undersuit combines Thinsulate BZ400 by 3M, Thermo Pile and contrast materials to provide high thermal comfort while keeping enough freedom of movement for valve operation, finning and stage handling. The manufacturer specifies a warmth value of 1.80 CLO and a recommended water-temperature range of 0-17 degrees C.

Why choose the SANTI BZ420X?

• Very warm insulation for cold-water and technical drysuit diving.
• Two-way front zip for easier use before and after the dive.
• Two side pockets and one internal left-chest pocket.
• Comfortable collar and grey internal suspenders.
• Elastic waist panel plus shoulder and knee gussets for better mobility.
• Rubber thumb loops help route air toward dry gloves.
• Wide 10 cm ankle elastics reduce leg ride-up while putting on a drysuit.
• Reflective tapes improve visibility around the diving site.
• Prepared openings for two P-valves and one heating cable.

Specification

Choose the size according to the drysuit, base layer and expected water temperature. For very long or repetitive cold-water dives the BZ420X can also be combined with suitable heated layers, following the drysuit and heating-system instructions.