In commercial diving, a wetsuit isn't just about comfort — it's a functional piece of safety equipment. Choose the wrong one for the conditions and you're looking at heat loss, restricted movement, or worse. Here's what to consider before you suit up.
Thickness Matters More Than You Think Wetsuit thickness is measured in millimetres and directly affects thermal protection. For warm water work, a 3mm suit is typically sufficient. Temperate conditions call for 5mm, while cold water environments — anything below around 15°C — demand 7mm or a drysuit altogether. Commercial divers often work long bottom times, so even mildly cool water can cause heat loss to creep up faster than expected.
One-Piece vs. Two-Piece A two-piece wetsuit — a long john with a separate jacket — offers double the neoprene across the core and is popular in commercial diving for extended dives in cooler conditions. One-piece suits are simpler to don and fine for shorter, warmer dives. Many experienced divers keep both and choose based on the job.
Fit and Mobility A wetsuit that's too loose lets water flush through constantly, stripping away the warmth. Too tight and it restricts breathing and arm movement — a serious issue when you're working physically underwater. The fit should be snug with no excess material, particularly around the neck, armpits, and knees.
Neoprene Quality and Durability Commercial diving is hard on equipment. Budget neoprene compresses quickly under pressure, losing its insulating properties at depth. Invest in high-density or heavy-duty neoprene that maintains its loft across multiple dives and holds up to the abuse of a working environment.
Hood, Gloves, and Boots Thermal protection is only as good as the weakest point. Exposed extremities and an unprotected head account for significant heat loss. In commercial conditions, a separate hood, gloves, and thick-soled boots aren't optional extras — they're part of the thermal system.
Know When a Wetsuit Isn't Enough There's a point where conditions demand a drysuit — contaminated water, very cold temperatures, or long decompression dives where sustained thermal protection is critical. Knowing that threshold and respecting it is part of choosing the right kit for the job.
