Santi BZ420X Heated Undersuit

The Santi BZ420X Heated Undersuit is an advanced version of Santi’s flagship model, designed for even greater warmth and comfort while diving in a drysuit. 

It offers unparalleled thermal comfort even in extreme conditions thanks to construction improvements and new materials.

The heated BZ420X undersuit is designed to comprehensively protect the whole body of a diver from the cold. The heated undersuit heats the trunk, thighs and arms evenly.

It is designed to be worn on top of a thin base layer, allowing most of the generated heat to be passed directly to the diver’s body.

The heated Santi undersuit gives you the best thermal protection underwater. It keeps you warm and comfortable while heating, even when the batteries are low or completely drained.

What’s new in the BZ420X Heated Undersuit?

A high-quality and thicker inner layer provides superior thermal insulation, making it warmer than BZ400 Extreme.

The new cable layout ensures more even heat distribution and more efficient heating.

A new, smooth inner material makes donning and doffing easier. The “brick” pattern of the improved quilting enhances flexibility and body fit.

Key specifications of the Santi BZ420X Heated Undersuit 

• Operating time: Approx 3 hrs on 28Ah battery
• Grammage: inner layer 290g/m2; out layer 420g/m2
• Men’s and Women’s sizes or Made to Measure option
• Works only with: SANTI Thermovalve and SANTI Drysuit Connector
• Don’t combine with other connectors or batteries higher than 12V
• Maximum heating temperature: 45°C
• Maximum heating power: 110W
• Temperature and overcurrent protection
• Retains insulating function even when heating is off
• Ergonomically placed wiring for unrestricted movement
• Heating elements positioned on the torso, thighs, and arms
• Extra pocket for power cables
• Waterproof connector compatible with other Santi products, flexible and damage-resistant cable
• Additional cables in sleeves for heated gloves connection
• Elastic waistband
• P-valve holes on both sides in standard
• Two sides pockets
• Water-resistant cuffs
• Straps at cuffs to allow air release and prevent sleeve slipping
• Two-way zipper

Santi Heating Systems at glance

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 BZ420X Heated Undersuit ordered, sculpting standard suits to a divers' measurements.

With your Santi BZ420X Heated 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.

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.

UNDERWATER EXPLORERS LTD/DIRDIRECT DISCLAIMER:
It is the customers responsibility to choose a correct drysuit size. Modified undersuit returns are not accepted under any circumstance unless Underwater Explorers Ltd/DirDirect has made a mistake. We do not take any responsibility for a fit of suits unless measured by us. 

HOW TO MEASURE YOURSELF FOR SANTI SUITS

Carefully watch SANTI's Instructions for Measuring video below. The video shows all measurements for made to measure suits. For standard size or Made-to-Fit measurements please use the Size Chart.

STEP-BY-STEP

Never take your own measurements yourself! Measurements should be taken by another person to make sure all measurements are taken tight up to the body and at correct placement for a specific measurement.

It is important that you stand straight, look forward and do not bend over while you are being measured. It is equally important to take the measurements only while wearing thin clothing, close to the body. Don’t leave any additional measurement allowance.

CHEST - on the widest point.
INNER ARM - from armpit to wrist.
BICEPS - widest point on the loose arm. If you have a visibly athletic figure it is advised to measure the biceps also with bent elbow.
FOREARM - in the widest point.
WAIST - measure on the belly button level. Remember to measure the waist line in the widest point on the belly button line. To measure a female waistline correctly, use any kind of "marker belt" and fasten it around the waist line.
HIPS - in the fullest point of the buttocks.
INNER LEG - hold one end of the measurement tape in the crotch and measure to the heel end.
THIGH - widest point approximately 5cm from the crotch area.
CALF - measure the calf at the widest point.
BODY TRUNK - hold one end of the tape on the central point of the neck end and lead the tape across the crotch to the back. Mark the place where tape ends and measure the rest of the line to the spine neck bone. Make sure the tape is close to the body including all the curves.

UNDERWATER EXPLORERS LTD/DIRDIRECT DISCLAIMER:
It is the customers responsibility to choose a correct drysuit size. Modified undersuit returns are not accepted under any circumstance unless Underwater Explorers Ltd/DirDirect has made a mistake. We do not take any responsibility for a fit of suits unless measured by us. 

SHIPPING:

We aim to dispatch all in-stock items within 2 working days but will inform you of approximate delivery times should any item on your order be out of stock or on supplier backorder due to current manufacturing or transport delays caused by global shortages and/or impeded production.

Please refer to our Shipping Policy and Returns & Refunds Policy for detailed information on delivery terms and returns.

Our current shipping rates are as follows:

• UK mainland orders £45 and over: FREE
• UK mainland orders under £45: £4.90 Fixed Rate
• Scottish Higland and Islands & Isle of Man: £9.90 Fixed Rate
• Channel Islands & Northern Ireland: £14.90 Fixed Rate
• European Union: £13.90 + 5% of order value (maximum £30)
• Rest of the World: £19.50 + 8% of order value (maximum £55)
• BFPO Post Codes: £20

INTERNATIONAL EXCEPTIONS:

For international orders containing weights, cylinders (excluding suit inflation bottles) and Suex scooters please contact us in advance before placing your order.

These products are not included in our global max-capped shipping rates and are only shipped outside of UK mainland after freight cost is calculated based on total weight, dimensions of parcel, location of delivery and the courier service used. We will let you know what this cost will be before processing any order.

All cylinders we ship within and outside of UK mainland are filled and tested on site before being emptied for dispatch. Cylinders shipped outside of the UK will be empty and will also have their valves removed, requiring reassembly after you receive delivery. Twinset manifolds and bands will also be removed and dispatched together with the cylinders for safe global shipping.

RETURNS & REFUNDS

We offer a 30 day return for any product sold under our Returns & Refunds Policy Please contact us before any return with your order number and date details. Receive our Returns Authorisation Form and instructions and enclose them with your return to expedite a refund. Detailed information is available in our Returns & Refunds Policy.

Email us at sales@dirdirect.com or call us on +44(0)1305 824 555

Note that all returned items are shipped at the customer's own risk and remain the customer's property until received by Underwater Explorers, so please ensure they are packaged well and use reliable postal services with tracking facilities. The goods will be inspected on arrival. 

Return postages are at your own cost and our outbound shipping costs (if items are sold with integrated basic shipping charges i.e. Free shipping for orders £45 and above) the UK shipping rate may be deducted from any UK mainland refund unless linked to a fault/defect claim. 

Please contact us with your order number and name before sending any returns to:

Underwater Explorers – Returns
Unit 1, Maritime Business Centre
Mereside, Portland
Dorset, DT5 1FD 
United Kingdom

Please refer to our Shipping Policy and Returns & Refunds Policy for detailed information.