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SDS Watersports are a award winning diving equipment retailer, trusted supplier & warranty repair centre for the industries top diving equipment brands & the only retail dive shop to win the diver magazines retailer of the year award seven times.

Santi Extreme BZ 400/200 Mens Undersuit

The Santi Extreme BZ 400/200 Mens Undersuit is designed for diving in water temperature less than 7°C. The BZ 400 insulation is  used in main body and BZ 200 is used in arms and legs for better mobility. It is up to you where you want the thinner insulation to be located. It is also ideal for long deep diving, with decompression. The model is basing on BZ 400 cut.

We used the best materials and technologies available to produce this undersuit.

Thinsulate™ BZ 400 insulation is recommended by 3M as optimal for diving undersuits, because it is compressed and doesn’t take too much space under the suit. It also has a net layer, which make s the undersuit even more durable and practically indestructible. The lining is made of soft micropolar 140g/m2.

The outside layer is made of 6.6 Polyamide 100% additionally reinforced with polyester fabric in the areas exposed to damage.

In this model we used also good solutions from other versions, like elastic gussets in arms and waist, wide ankle bands and water-resistant cuffs with tapes, which supply air to the dry gloves.



  • Thinsulate™ insulation
  • Weight: 420/210g/m2, warmth: 1,80/1,30 CLO
  • 3 pockets – one of them fastened
  • Water-resistant cuffs
  • Tapes, which supply air to the dry gloves
  • Banded collar
  • Two-way zip
  • Reinforcing patches on knees and arms made of polyester
  • In waist – elastic gusset made of windproof fabric
  • Elastic gussets in arms
  • Suspenders
  • Wide (10 cm) elastic ankle bands

    Santi Extreme BZ 400/200 Mens Undersuit Size Chart

    ChestInner ArmBicepsForearmWaistHipsInner LegThighCalfBody Trunk
    XS162 - 166cm
    84 - 88cm
    51cm28cm26cm70 - 74cm
    84 - 88cm74cm50cm34cm155cm
    S168 - 172cm
    90 - 94cm
    52cm29cm27cm76 - 80cm
    90 - 94cm76cm52cm36cm160cm
    174 - 178cm
    92 - 96cm
    53cm30cm27cm78 - 82cm
    92 - 96cm80cm52cm38cm165cm
    M172 - 176cm
    96 - 100cm
    53cm32cm28cm82 - 86cm96 - 100cm79cm55cm39cm165cm
    ML176 - 180cm
    96 - 100cm
    55cm32cm29cm82 - 86cm96 - 100cm84cm55cm40cm170cm
    MLL182 - 186cm
    100 - 104cm
    57cm33cm29cm84 - 88cm100 - 104cm88cm55cm40cm175cm
    LS172 - 176cm
    106 - 110cm
    52cm35cm30cm92 - 96cm106 - 110cm79cm62cm43cm165cm
    180 - 184cm
    106 - 110cm
    54cm35cm29cm92 - 96cm106 - 110cm83cm60cm41cm170cm
    LL184 - 188cm
    106 - 110cm
    56cm36cm30cm92 - 96cm106 - 110cm86cm61cm42cm175cm
    XLS174 - 178cm
    112 - 116cm
    54cm38cm31cm100 - 104cm112 - 116cm80cm65cm44cm170cm
    184 - 188cm
    112 - 116cm
    56cm37cm30cm100 - 104cm112 - 116cm85cm65cm44cm175cm
    XLL192 - 196cm
    112 - 116cm
    58cm38cm30cm100 - 104cm112 - 116cm89cm65cm44cm180cm
    176 - 182cm
    188 - 122cm
    55cm40cm31cm108 - 112cm118 - 122cm80cm68cm46cm175cm
    XXL190 - 194cm
    118 - 122cm
    57cm40cm31cm108 - 112cm118 - 122cm84cm68cm46cm185cm
    192 - 196cm
    130 - 134cm
    58cm42cm32cm116 - 120cm130 - 134cm86cm72cm47cm195cm

    This size charts is to be used as a guide only. if you are between sizes, we recommend you go to the next larger size, if you are unsure please feel free to give us a call, one of our friendly staff will help you select the correct size.


    Free UK Mainland Postage On All Orders Over £150.00

    No matter how many items are in your shopping cart (cylinders excluded)

    It will be added within your shopping cart once the total reaches £150.00

    UK Mainland delivery on all orders under £150.00

    Up to 1kg – 1st class recorded £5.00

    2kg to 20kg – 24 hour overnight £9.00

    Over 20kg - add £9.00 per additional 20Kg or part thereof

    free delivery promotion

    Postage charges for the Santi Extreme BZ 400/200 Mens Undersuit can be calculated and added to your order either on the cart or checkout pages.

    See Our Delivery Information Page For More Information.

    Buy Today On Finance - It's Quick & Easy!

    Omni Capital Retail Finance

    We now have the ability to provide our customers with the opportunity to take out finance on a range of equipment and servicing through the finance company Omni Capital Retail Finance.

    You can now easily spread the cost over 12 months on purchases of £500 or more, allowing you to choose an affordable monthly repayment that suits your budget

    The application is quick and easy, the process can be completed in just a few minutes with an instant decision.

    Credit is provided subject to age and status.

    See Our Finance Information Page For More Information.

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    • Santi Scuba Diving Drysuits
    • OUR PRICE £339.00

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