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Santi Extreme BZ 400X

Santi Extreme BZ 400X

Santi Extreme BZ 400X
Santi Extreme BZ 400X

589,00 + delivery costs
Incl. VAT 24 %
VIP-customers don't get a discount for this product



Other feature
Undersuit with normal sizing, without name tag

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Some items of this product are available in our stock. The delivery time for this product is immediately if it is in our stock. Otherwise it is approximately 15 - 60 day(s) from the order. The reliability of the estimation is good.

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Location Store (Helsinki): Scuba diving & water sports, Warehouse

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Product description

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.

Thinsulate™ BZ400 insulation is recommended by 3M as optimal for diving undersuits due to its thermal features and pre-compressed insulation.

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.


  • Thinsulate™ BZ400 Insulation,
  • weight 420 g/m2, warmth: 1,80 CLO,
  • weight: 2,1 kg.


  • 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,
  • inside suspenders,
  • wide elastic ankle bands,
  • specially designed p-valve and heating openings.
SUITS MADE TO MEASURE: If you want to have your suit tailored to be made to measure, please contact us and book a fitting.

The approximate size of the packed product or the sales package is 500 x 400 x 250 mm.


2,1 kg
(with sales package 2,5 kg)

120 month(s)

Country of origin

Buy It For Life™

Buy it for Life -tagged products are durable and possible to repair. We have extended warranty time for these products to 120 months. That means 10 years.

mikael j. verified buyer, 3.11.2022
Overall rating
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It is as usual cheaper with you, it is warm when diving in cold water
Anonymous verified buyer, 30.9.2022
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Very warm and well-fitting suit
Anonymous verified buyer, 13.8.2022
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Nicely snug compared to many thick underwear, that's why I bought this. There's enough heat.
Anonymous verified buyer, 15.1.2022
Overall rating
Great confort and very warm. Zippers are very smooth. I had a small water leak (non related to this product) and the Santi kept me surprisingly warm and dry. Maybe a bit thicker than expected. That is noticeable on my dry suit and packing… on my first drives I had to add small weight (+1kg)
Roman M. verified buyer, 2.1.2022
Overall rating
Great product, fast delivery ....
Rupert S. verified buyer, 15.10.2021
Overall rating
After adjusting, it fits well and does a good job.
Brett H. verified buyer, 4.8.2021
Overall rating
This keeps my wife toasty warm and it fits nicely under the Waterproof Drysuit - ISS7
ALEKSANDR O. verified buyer, 18.6.2021
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Wonderful jumpsuit. I am very glad that I purchased it. Warm, tight. Very good for diving in cold water
Erkka S. verified buyer, 24.11.2020
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A sturdy underwear that exudes quality and warms up really well. The lightening of the bends nicely reduces the Michelin man's feel. I recommend.
Hugh M. verified buyer, 22.7.2020
Overall rating
Purchased Large, which fits my sizing perfectly. 179cm/92kg. Provides great warmth for long cave dives in South Australia with water temp 12 - 16 degree Celsius.
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