Santi BZ400X Undersuit
Santi BZ400X Undersuit
Santi BZ400X Undersuit

Santi BZ400X Undersuit

Sale price£428.00

The Santi BZ400X undersuit, with a sporty design, is the warmest undersuit on offer from Santi. It is designed for diving in water temperature less than 7°C. It is also ideal for long deep diving, with decompression. Some of the best divers and instructors around the globe have helped Santi to develop this Undersuit.



Modifications to Size

Modifications to Size


Standard sizes dispatched in 1 to 2 days


Our email address is
 Alternatively, you can call us on +44 (0) 1305 824 555
Underwater Explorers
Unit 1, Maritime Business Centre
Mereside, Portland, Dorset, DT5 1FD
United Kingdom

Santi BZ400 has all the solutions a diver needs. Santi used the best materials, technologies and expertise available to produce this undersuit.

Thinsulate BZ400 insulation is recommended by 3M as optimal for diving undersuits, because it is compressed and does not take up too much space under the suit. It also has a net layer, which make the undersuit even more durable and practically indestructible.

The lining is made of soft micropolar 190g. The outside layer is made of 6.6 Polyamide 100% additionally reinforced with polyester fabric in the areas exposed to damage. In this model, Santi used the best solutions from the previous version, like elastic gussets in the arms and waist, wide ankle bands and water-resistant cuffs with tapes, which supply air to the dry gloves.

  • 3 pockets including inside pocket
  • Wide (10 cm) elastic ankle bands
  • Waist belt
  • Water-resistant cuffs
  • Tapes, supply air to the dry gloves
  • Banded collar
  • Two-way zip protected with a flap
  • Reinforcing patches made of polyester
  • Elastic gussets in arms
  • Suspenders
  • Thinsulate™ Insulation
  • In waist – elastic gusset
  • Wide back elastic belt
  • P-valve holes
  • Heating cord holes

FREE "Made to Fit"

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 size suit ordered, sculpting standard suits to a divers' measurements.

With your 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.

SKU: 2003.XS