The O'Neill Epic 4/3mm steps up O'Neill's proven Epic construction for cold-water surfing in the 50–60°F range. With the same trusted combination of Wind-Proof Smoothskin panels, FluidFlex Firewall lining, and GBS seams as the 3/2mm — but with extra neoprene thickness through the torso — the Epic 4/3mm keeps you in the water through fall and winter without sacrificing the mobility you need to surf well.

Wind-Proof Smoothskin panels on the chest cut convective heat loss between sets while FluidFlex Firewall neoprene delivers consistent thermal warmth across core panels. UltraFlex neoprene throughout the arms and legs ensures the added thickness doesn't come at the cost of paddle comfort. GBS (Glued and Blind Stitched) seams seal against water infiltration, and the Minimal Seam layout reduces bulk and friction points. A Double Super Seal collar locks out flush at the neck, while Hand-Cuff Stitch Sleeve Anchors keep wrist seals in place during paddling. Krypto Armor knee panels reinforce the areas most prone to board abrasion, and an interior key pocket keeps essentials accessible.

• Outer Panels: Wind-Proof Smoothskin on chest for heat retention out of the water
• Thermal Lining: FluidFlex Firewall neoprene across core panels
• Neoprene: UltraFlex high-stretch neoprene in arms and legs
• Seams: GBS (Glued and Blind Stitched) with Minimal Seam design
• Closure: Back zip with Double Super Seal collar
• Fit Details: Hand-Cuff Stitch Sleeve Anchor to prevent sleeve ride-up
• Durability: Krypto Armor reinforced knee panels
• Storage: Interior key pocket
• Water Temp: Recommended for 50–60°F (cold water, fall/winter)

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.