O'Neill Defender 3/2 Chest Zip Steamer Wetsuit Mens

Warmth and stretch in one good-looking, well-priced package. The Defender 3/2 packs premium warmth features — Firewall lining, mesh back panel — into a full-stretch steamer built to keep you in the water longer. ($399.99)

Key Features

• UltraFlex DS arms — high-stretch neoprene for paddling freedom
• PolarFlex Firewall lining that retains heat and, per O'Neill, dries in about 30 minutes
• Soft, insulating UltraFibre interior for added comfort and warmth
• Glued & blindstitched seams with 50% internal fluid taping — sealed from knees to collar
• MeshSkin back panel to cut wind chill
• Single Seal Collar for a comfortable, secure fit that minimises flushing
• Chest-zip entry in a 3/2 built for cool-to-mild conditions

Details

• Thickness: 3/2mm (3mm core / 2mm arms & legs)
• Arms: UltraFlex DS high-stretch neoprene
• Lining: PolarFlex Firewall + UltraFibre interior
• Seams: glued & blindstitched + 50% internal fluid taping
• Entry: chest zip
• Collar: Single Seal Collar
• Panels: MeshSkin back panel
• Colours: Black (2025), Navy, Black (2026)

Who It's For

• Surfers who want premium warmth features without a premium price
• Cool-to-mild water sessions through autumn, winter and spring
• Anyone upgrading from an entry-level 3/2 who wants a warmer, drier suit
• Value-minded surfers who still want stretch, warmth and a sharp look

Sizing

Sizes on file run S, MS, M, MT, LS, L, XLS, XL, XXL. O'Neill's base letter is chest/girth (S/M/L/XL); the S/T suffix tunes for height (S = shorter, T = taller) at that chest. A 3/2 is 3mm through the core for warmth and 2mm in the arms and legs for flex — a rough guide of around 15–19°C, a solid cool-to-mild all-rounder. This is a chest-zip suit. For the Firewall lining and mesh back to keep you warm, aim for a snug, second-skin fit with no gaps at the lower back, wrists or ankles. Note: three colourways are live (Black 2025, Navy, Black 2026) — confirm which season/stock the copy should lead with. Sizing follows O'Neill's official men's chart — match your height, weight and chest to your size code and you're sorted.

Stuck between two sizes? Go down a size. Still not sure? Get in touch and we'll help you nail the fit.