The Santi BZ420X Heated Undersuit is an advanced version of Santis 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 divers 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.

Whats 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
• Mens and Womens sizes or Made to Measure option
• Works only with: SANTI Thermovalve and SANTI Drysuit Connector
• Dont combine with other connectors or batteries higher than 12V
• Maximum heating temperature: 45C
• 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.