The Santi BZ420X is the latest advancement in undersuit technology, building on the success of the BZ400X. Crafted for the harshest and most challenging diving conditions, this undersuit provides exceptional insulation, robustness, and comfort, making it an ideal choice for divers in cold waters. The BZ420X features upgraded Thinsulate material for enhanced warmth without compromising its underwater flexibility. With a modern design and reinforced areas for added durability, it ensures both style and functionality for extreme cold-water dives. Enhanced insulation with improved Thinsulate material for superior warmth High-quality Thermo Pile 100 fleece for increased comfort and breathability Reinforced upper chest and shoulders for added protection in high-wear areas Sleek "brick" pattern design for a contemporary look Two side pockets and an inside pocket on the left chest for convenience Reflective tapes for increased visibility Rubber thumb loops to facilitate air supply to dry glove