Santi BZ420X Undersuit — a high-performance thermal undersuit designed to deliver superior warmth, comfort, and freedom of movement for cold-water diving.

Insulation: Upgraded Thinsulate BZ400 by 3M combined with Thermo Pile 100 fleece (220 g/m²), providing effective thermal protection in water temperatures from 0°C to 17°C. Total insulation: 420 g/m².

Design & fit:

• Shoulder, knee and waist-elastic gussets for maximum flexibility and unrestricted movement.
• Two-way front zipper and comfortable collar for easy donning and doffing.
• Rubber thumb loops and wide elastic ankle bands prevent the undersuit from riding up when dressing the drysuit.

Practical features:

• Two side pockets and an internal left-chest pocket for secure storage.
• Designed to accommodate two p-valves and one heating system.
• Reflective tape for improved visibility in low light conditions.

Materials & weight: Constructed from high-quality insulation materials; approximately 2.1 kg (Men’s size L).

Available in both Men’s and Ladies’ First versions for a tailored fit.