The O'Neill Psycho 3mm Coldwater Surf Hood delivers serious warmth for cold-water surfing — a 3mm full hood built on O'Neill's Psycho-line neoprene to keep your head, ears, and neck insulated through deep winter sessions in the 45–58°F range.

Key Features:

• 3mm Neoprene Construction — full 3mm insulation throughout provides substantial thermal protection for head and ears during extended cold-water sessions; rated for water temperatures from 45–58°F
• Psycho-Line Stretch Neoprene — high-stretch neoprene construction maintains mobility through duck dives and head turns without the rigid, neck-straining feel of cheaper hoods
• Full Face Seal — contoured face opening seals tightly around the jawline, forehead, and cheeks to block cold water flush; key feature in overhead+ conditions where wipeouts are heavy
• Glued and Blindstitched Seams — sealed seams prevent water infiltration at stitch lines; critical in a 3mm hood where any seam flushing rapidly chills the head and causes ice-cream headaches
• Wetsuit Integration — collar designed to tuck into or layer under a wetsuit neck seal, creating a continuous thermal barrier from head to torso

Head warmth is disproportionately important for overall thermal comfort in the water — you lose a significant amount of body heat through your head, and cold ears cause pain that ends sessions faster than cold anywhere else. At 3mm, this hood is for genuine cold-water surfing: West Coast winter, East Coast late fall through early spring, or any lineup where your 5/4 wetsuit still leaves your head freezing. Pair with 3mm gloves and booties for a full cold-water kit.

Sizing & Fit: Size by head circumference. Hood should create a complete seal around the face without pulling or gaping. If between sizes, size up for comfort over long sessions — a hood that's too tight causes headaches quickly.

Care: Rinse thoroughly with fresh water after every session. Hang inside-out to dry completely in shade. Do not machine wash or tumble dry.