Custom Tech 400 Undersuit

Custom Tech 400 is an undersuit for technical and regular diving in cold water from 0°C to +5°C. A density of 400 g/m² provides reliable insulation during long technical dives while staying thin and elastic enough not to restrict movement underwater.

Custom Master undersuits are made from synthetic fiber with a bulky weave — a material that retains heat even when compressed under dry suit pressure. Fits any dry suit regardless of manufacturer. Flat seams to avoid chafing, reinforced knees and elbows, elastic cuffs for easy donning.

The material doesn’t absorb moisture and ventilates well — critical when condensation forms inside the dry suit during a dive. The undersuit keeps its insulating properties even after repeated compression and washing.