Santi Heated BZ400 Extreme Undersuit

From: £540.83 + VAT

The Santi Heated BZ400 Extreme Undersuit is specifically designed to provide full-body protection against the cold. It should be worn over a thin base layer, allowing the majority of the heat generated by the suit to be transferred directly to the diver’s body for maximum warmth and comfort.

SKU: 2024.M Category:

The Santi Heated BZ400 Extreme Undersuit offers full-body protection against cold for divers, providing evenly distributed heat to the trunk, thighs, and arms. Designed to be worn over a thin base layer, this heated undersuit maximizes heat transfer directly to the diver’s body, ensuring optimal warmth and comfort underwater.

Even when the battery is low or fully drained, the BZ400 Extreme Heated Undersuit continues to offer superior thermal protection, keeping you warm. Its new generation heating wire is coated with ultra-soft silicone insulation that is resistant to breakage, and the innovative synthetic power cable can withstand high temperatures and cuts.

Key Features of Santi Heated BZ400 Extreme Undersuit:

  • Heating Coverage: Heats trunk, thighs, and arms evenly
  • Material: Made of BZ400 (420g/m²) Thinsulate™ for superior warmth
  • Compatibility: Works exclusively with Santi Drysuit Connector or Thermovalve; do not combine with other connectors or batteries exceeding 12V
  • Safety: Includes a safety switch to prevent overheating
  • Convenient Design:
    • Handy waist pocket for power cord
    • P-valve hose opening
    • Elastic waist band with two side pockets
    • Net cuffs with rubber loops for thumbs
    • Elastic gussets under the armpits for better fit and flexibility
    • Two-way entry zipper and foot straps for added comfort and adjustability
  • Heating Power: 110W
  • Maximum Heating Temperature: 45°C
  • Battery Operating Time: Approximately 2h 30min to 3h with a 24Ah battery

Additional Features:

  • Undersuit Bag included for storage
  • Made to Fit Service: Santi offers a free “Made to Fit” service for any standard BZ400 Extreme Heated Undersuit. This service allows you to request up to 4 custom adjustments (2-5 cm) to your measurements, ensuring a tailored fit. Additional adjustments can be made for a small extra fee.

This heated undersuit is the ultimate solution for divers seeking top-tier thermal protection, even in the coldest water conditions.

Additional information

Weight 25 kg
Gender

Female, Male

Suit Size

2XL, 2XLS Male size only, 3XL, L, LL, LLL Male size only, LS, M, ML, MLL, S, SL, XL, XLL Male size only, XLS, XS

Modification to Size

4 Modifications (2cm-5cm), 5 Modifications (2cm-5cm) + £40, None

Size Chart

Measuring Guide

HOW TO MEASURE YOURSELF FOR SANTI SUITS

Carefully watch SANTI’s “Instructions for Self-measuring” video below. The video shows all measurements for Made-to-Measure suits.

STEP-BY-STEP

Download the Santi MADE TO MEASURE FORM. Use only a taylor’s tape measure that has a centimeter scale (only use metric with cm).

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.

HEAD – approximately 1cm above the eyebrows to choose the correct hood size.
NECK – above the t-shirt line, under the Adam’s apple and the end of the neck.
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.
SHOULDER TO SHOULDER – back shoulders length from one top arm bone to another.
OUTER ARM LENGHT – from the back neck spine bone to the wrist while the arm is fully stretched.
INSIDE ARM LENGHT – from armpit to wrist.
LADIES ONLY / SIDE TRUNK LENGHT – from the armpit to the waist line.
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.
WRIST – between the palm and the wrist bone.
CHEST – first measure the chest in rest and then after breathing in air. Normally the difference should be around 3-5cm. For ladies measure in the fullest point of the bust, preferably while wearing a bra.
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.
LADIES ONLY / BACK HEIGHT – centrally from the neck spine bone to the waist line marked with the belt.
LADIES ONLY / CHEST HEIGHT – from the soft neck area (where the neck ends) to the bust line in the fullest point.
HIPS – in the fullest point of the buttocks.
THIGH – widest point approximately 5cm from the crotch area.
CROTCH TO KNEE – from crotch to knee.
CROTCH TO FLOOR – hold one end of the measurement tape in a convenient place in the crotch and measure to the heel end.
CALF 1 – measure the calf in the widest point.
CALF 2 – height from the widest point of the calf to the floor.
CALF 3 – measure the calf 20cm from the floor.
ANKLE – measure the ankle on the ankle bone.
FOOT – place the tape on the floor and step on it to measure from end of heal to end of toes.

UNDERWATER EXPLORERS LTD/DIRDIRECT DRYSUIT DISCLAIMER:
It is the customers responsibility to choose the correct drysuit size. All drysuits are made to order. Drysuit 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 a made to measure drysuits unless measured by us. All drysuits are individually tested by manufacturers. Any isolated manufacturing fault(s) will be repaired, not replaced, under manufacturers warranty.