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Don't let punishing cold and rugged terrain keep you from the barrel of a lifetime—invest in the O'Neill Men's Psycho ST 4/3 Boot. Super flexible and soft 4/3-millimeter UltraFlex DS neoprene provides unrestricted movement and stellar comfort while its Firewall insulation wicks away moisture and increases warmth. Thanks to its external Fluid Seam Welded seams and internal taped seams, the Psycho ST 4/3 offers a comfortable watertight seal from the elements. For improved balance, O'Neill gave this solid bootie a deep split-toe design with leash stop toe guard. Heel pull tabs help supply ease of entry and exit while a forefront cinch hook-and-loop system and anti-flush shin straps ensure a solid, comfortable fit.

  • 4/3mm UltraFlex DS neoprene
  • Firewall insulation
  • 1X Fluid Seam Welded construction
  • Advanced heel cupping design
  • Deep split-toe design with leash stop toe guard
  • Forefront cinch hook-and-loop system
  • Heel pull tabs

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