O'Neill Psycho One 4/3 Chest Zip Wetsuit

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Offering no restrictions and incredible warmth, the O'Neill Psycho One Chest Zip Wetsuit is a performance surfing wetsuit in a simple, yet perfect package. Dropping the extra panels and shedding all but the best features, the Psycho One boasts insane pliability with the highly advanced TB3 (TechnoButter 3) Neoprene. The hydrophobic, and soft to the touch, TB3 Neoprene incorporates O'Neill's exclusive feather-lite ENVY foam core, creating one of the lightest and most flexible wetsuit components to date. Pairing TB3 with O'Neill's water tight F.U.Z.E. chest zip entry system creates a suit that's easy to get into and snug and secure once you're in the water.

An ultra-flexible and highly durable Fluid Seam Weld locks the outside of all the seams from cold leaks and lengthens the overall life of the suit. With a rash resistant collar and interior water barrier, the Psycho One offers comfort, warmth, and durability in a super lightweight, quick-drying suit. Stay warm without feeling smothered in layers of rubber, pull on the Psycho One and step into the water in your second skin.


  • Thickness: 4/3mm
  • Neoprene: TechnoButter 3
  • Seams: Sealed/Taped
  • Zipper: Chest Zip
  • Hood: None
  • Model Year: 2019/2020
  • Manufacturers Part Number: 4967

Product Features

  • TechnoButter 3 Neoprene
  • F.U.Z.E chest entry
  • Right to left chest closure
  • Single Fluid Seam Weld
  • Super seal cuffs on wrists and ankles
  • 360° barrier with drainholes
  • Double seal collar
  • Krypto knee padz for durability
  • Hidden key pocket with loop on lower right leg
  • Minimal seam design for insane flexibility, fit and durability
  • Aqua Alpha: eco friendly solvent glue that is water based and free of VOC's
  • Limestone-based neoprene sourced from Japan
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If you are not 100% satisfied with your purchase you may return it for a full refund, or exchange within 30 days of receiving your order.