Santi\'s BZ420X

Product information

Introducing Santi’s BZ420X, the latest and enhanced version of the best-selling BZ400X undersuit. Designed for the coldest and most demanding diving environments, the BZ420X offers superior insulation, durability, and comfort, making it the ultimate choice for cold-water divers.

The NEW Santi BZ420X Undersuit is the latest evolution of Santi’s best-selling BZ400X undersuit. It is now even warmer and more advanced!

Building on the success of the BZ400X, this new version is designed to offer even better insulation for the coldest and most demanding diving conditions. The Santi BZ420X Undersuit provides superior insulation, durability, and comfort, making it the ultimate choice for cold-water divers.

The BZ420X retains all the best features of the popular BZ400X: the signature elastic cuffs, inner suspenders, and convenient air flow ribbons for dry glove systems, ensuring full freedom of movement and ease of use during dives.

Upgraded Insulation

The Santi BZ420X continues to use the classic Thinsulate™ material, trusted for over 30 years in the diving industry. This time, Santi made it even better with enhanced thermal properties, offering superior warmth while maintaining its non-compressive nature underwater.

Thicker Polar Fleece

Santi has replaced the Micropolar from the BZ400 with a high-quality standard fleece Thermo Pile 100 for increased warmth and comfort. Designed for intensive wear, thermoactive and breathable fabric, giving freedom of movement.

Reinforced Design

Additional reinforcements with contrast material on the upper chest and shoulders ensure durability in areas prone to wear without sacrificing flexibility.

Modernised Aesthetics

The design has been refreshed, swapping the diamond quilting for a more modern "brick" pattern, offering a sleek, updated look that complements its superior performance.

Santi BZ420X features

Two side pockets
Inside pocket on the left chest,
Reflective tapes
Rubber thumb loops that supply air to dry gloves
Elegant and comfortable collar
Two-way zip
In waist-elastic gusset
Shoulder and knee gussets for free movement
Grey inside suspenders
Two p-valve openings
One Heating opening
Wide (10cm) elastic bands at the ankle to prevent the legs from riding up
Comes with a durable bag
Santi BZ420X Specifications

Material Thinsulate™ BZ400 by 3M Insulation / Thermo Pile / Contrast material
Water temperature 0–17°C (comfy for 1,5 hour)
Warmth 1,80 CLO
Total weight [L] 2,1 kg
Grammage 420g/m2 / 220g/m2 / 196g/m2

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