Santi BZ400X Undersuit


Dedicated to dive in the water in temperature from 0°C.
Ideal for long and deep dives requiring decompression, even in warmer waters.

Made of Thinsulate™ BZ 400, recommended by 3M as by far the most optimal for thicker diving undersuits. Compressed, takes up less space under the drysuit. It has also pressed in a layer of fine mesh that reinforces the entire structure. The insulating layer even after flooding keeps the temperature and protects against hypothermia.The construction designed to avoid “Cold spots” or places through which the generated heat could escape.

Classic yet top of the list diving undersuit with the highest thermal protection available on the market. Undersuit BZ400X comes with modern and fit cut to increase your diving comfort and good looks. Dedicated for cold waters with less than 7°C temperature, it is ideal and unreplaceable for long deep diving, with decompression. Low water absorbing, high breathability features. Keeps a diver warm even if wet.

Lining made of soft microfleece 140 g/m2. The outside layer made of Polyamide additionally reinforced with Polyester fabric in the areas exposed to mechanical damage.


  • breathable insulation,
  • two side pockets,
  • one inside pocket on the left chest,
  • reflective tapes,
  • rubber thumb loops, that supply air to dry gloves,
  • elegant and comfort collar,
  • two-way zip,
  • reinforcing patches on knees, shoulders and back,
  • in waist-elastic gusset made of windproof fabric,
  • shoulder and knee gussets allowing free movement,
  • wide elastic ankle bands,
  • specially designed p-valve and heating openings

SANTI BZ400X undersuit provides 16 sizes men and 12 sizes women that fit most of standard, tall or short body silhouettes.

Measure yourself according to given instructions and look up in our size chart for the best suitable size. We can help if you need it. If you will not be able to match the size, SANTI offers best made to measure dry suits and undersuits on the market. SANTI MTM suits are cut specifically, considering up to 24 body measurement points.

Browse these categories as well: Santi, Drysuits
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