The O’Neill Psycho Tech 5mm+ ST Boot belongs to O’Neill’s premium line of cold-water gear, developed by the Area 52 R&D team to perform in the harshest elements. With 5mm+ neoprene thickness, these boots deliver maximum thermal insulation, while TechnoButter 4 construction keeps them light and flexible. The internal TB4 Firewall adds extra heat retention and distribution, extending your comfort in icy waters.

Sealed with TB4X taped seams on the inside and Fluid Seam Weld on the outside, the boots effectively block water entry. The split-toe design improves board feel and stability, while the Arch Strap locks your foot securely in place and prevents sliding inside the boot. The O’Ring Seal around the ankle reduces flushing, and the Heel Pull makes getting in and out of the boots quick and easy. A durable outsole provides reliable grip and long-lasting wear, even under heavy use.