The O'Neill Heat 3/2mm is built for the surfer who needs reliable warmth without compromise. Designed for cool-water sessions in the 58–68°F range, the Heat delivers O'Neill's trusted thermal technology in a clean, streamlined package that moves with you from paddle to pop-up.

At the core of the Heat's performance is O'Neill's TB3 Firewall lining — a heat-reflective thermal barrier across the chest and back that traps body warmth where you need it most. TB3 continues through the arms, legs, and shoulders for total-suit coverage. Aqua Alpha neoprene panels enhance stretch and flexibility while Fluid Seam Weld construction seals seams to prevent water infiltration. The Minimal Seam design reduces chafe points and keeps the suit light and unrestrictive. A Double Super Seal neck closure locks out flush, and the Redzone back zip system makes getting in and out effortless. A key pocket keeps essentials secure while you're in the water.

• Thermal Core: TB3 Firewall chest and back panels for targeted heat retention
• Full Coverage: TB3 lining through arms, legs, and shoulders
• Neoprene: Aqua Alpha high-stretch neoprene for comfort and flexibility
• Seams: Fluid Seam Weld construction with Minimal Seam design
• Closure: Redzone back zip system
• Neck: Double Super Seal collar for flush prevention
• Storage: Interior key pocket
• Water Temp: Recommended for 58–68°F (cool water, spring/fall)

Sizing: O'Neill wetsuits run true to surf sizing. Refer to the O'Neill size chart and prioritize a snug fit through the torso — a properly fitted wetsuit should feel firm but not restrictive. If you're between sizes, size up for comfort.

Care: Rinse thoroughly with fresh water after each use. Hang to dry inside-out away from direct sunlight. Do not machine wash, tumble dry, or use hot water. Store flat or on a wide hanger to preserve neoprene shape.