Introducing the Santi BZ400X
Santi BZ400X Undersuit has all the solutions you need as a diver. Santi has used the best materials, technologies and expertise to produce this undersuit with many features. BZ400X is designed for cold waters with temperatures less than 7°C making it also ideal for long deep diving with decompression.
With feminine details, the BZ400X is also available in a lady’s version, Santi BZ400X Ladies First.

Santi BZ400X Undersuit features
- Breathable
- Two side pockets
- One inside pocket on the left chest
- Reflective tapes
- Thumb loops that supply air to dry gloves
- Elegant and comfortable collar and yoke covered with softshell
- Two-way zip
- Reinforcing patches on knees, shoulders and back
- In waist-elastic gusset made of windproof fabric
- Shoulder and knee gussets allow free movement
- Inside suspenders
- Wide (10cm) elastic ankle bands prevent moving up the legs
- P-valve and heating openings
Best thinsulate material
Santi has used the best materials and available technologies for the BZ400X undersuit.
The Thinsulate™ BZ400 Insulation, recommended by 3M, provides effective insulation, resistance to moisture and breathability. It is one of the best insulation which can be used in undersuits.
It is compressed, does not take up too much space under the drysuit, and does not restrict the diver’s movement. It has a net layer, which makes the BZ400X even more durable and practically indestructible.
- Thinsulate™ BZ400 Insulation
- Lining: Micropolar weight 420g/m, warmth: 1.80 CLO
- Outside layer: Polyamide, Polyester
- Weight: 2.1kg

BZ400X additional options
You can also request a name patch free of charge. Just let us know by equating for it at check out by writing it in the notes section.
Please note that once the order has been placed with Santi, this can no longer be added, so it’s important that you let us know when ordering.

FREE "Made to Fit" service
Very few divers require a totally made to measure suit due to the wide range of standard sizes available from Santi Diving. With this in mind, Santi offers a free of charge Made-to-Fit service to any standard Santi BZ400X Undersuit ordered, sculpting standard suits to a divers' measurements.
With your BZ400X Undersuit order, you can request up to 4 changes (ranging from 2 to 5 cm) to any of the standard size measurements listed under chest, inner arm, biceps, forearm, waist, hips, inner leg, thigh, calf or body trunk on the Santi size chart.
If you would require more than 4 changes to make your suit perfect, you can add two more changes for a small additional charge.

Uk Diving Academy is a Santi Centre specialising in standard and made-to-measure undersuits.
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