FREE WETSUIT SHAMPOO!
The 2021 O’Neill Psycho One 5/4 Back Zip is the ultimate wetsuit for cold water – now available in Chest or Back zip options.
2021 O’Neill Psycho One 5/4 Back Zip
FREE WETSUIT SHAMPOO!
The 2021 O’Neill Psycho One 5/4 Back Zip minimal seam madness is now available in F.U.Z.E. and Z.E.N. Zip Closures. The ultimate high-performance cold water wetsuit. Built with ultra gooey TechnoButter 3 Neoprene and ultra-minimal seam styling offers unrestricted mobility, enhanced durability and incredible fit. The Psycho One will raise your performance level to new heights.
Unsure of your size, check out our helpful Size Guide.
Technobutter 3 Neoprene
O’Neill’s exclusive new pre-stretched neoprene with featherlight, ENVY foam rubber core. Ultimate, flexibility, warmth and comfort. Built to last.
Single Fluid Seam Weld
O’neill’s exterior fluid seam weld is a revolutionary seam construction that utilises a non-chafing high-grade, silicone-based urethane applied in liquid form to outside of a glued and blindstitched seam completely blocking out water without restricting flexibility.
Patented Z.E.N. Zip Entry with Drainhole
O’Neill’s innovative patented Z.E.N. Zip Entry system is the most imitated entry/closure system in the world. This free floating exterior mini zip allows for a zipperless feel and stops water from entering the wetsuit. (U.S. Patent #5,898,934). Pullover internal seal that blocks out water for maximum performance. Water that penetrates the Z.E.N. Collar or Super short zip is blocked by the Barrier-2 and forced out the drain hole.
Double Superseal Neck
A toasty warm two layer design featuring a 360˚ smooth skin interior lining, wide adjustability, and a secure lock down. Fully adjustable and watertight.
Strategic Seamless Paddle Zones
2020 O’Neill Psycho One 5/4 Back Zip has an ergonomic, seamless under sleeve panel that allows for unrestricted motion and eliminates rashing. Flexible and unique design which utilizes minimal seam placement for comfort.
Sidewinder S-Curve Seams
Sidewinder S-Curve seams.
Krypto Knee Pads
Abrasion resistant, high stretch neoprene panel with ergonomic shaping for comfortable durability. Flexible and unique design utilises and extended knee pad for added durability.
External Key Pocket with Loop
Abrasion resistant, high stretch neoprene panel with ergonomic shaping for comfortable durability. Located along the lower leg inseam. Constructed with Fluid Seam Weld and UltraFlex DS neoprene, this key pocket has added strength, easy access and completely secure.
The 2021 O’Neill Psycho One 5/4 Back Zip – perfect for those colder winter months.
- UK: FREE standard delivery of 1-5 working days (usually 1-2 days) on all UK purchases over £79.99 – Upgrade to Express Delivery for £4.99 UK Orders under £79.99: £4.99 Standard, £6.99 Express
- Europe Mainland and UK Highlands & Islands: £9.99 on all items under 2 kg and £19.99 over 2kg
- Rest of the World and European Islands: £19.99 for small items under 2kg, £39.99 over 2kg and £69.99 for all items over 6kg. Fedex available as an upgrade option for all countries and the only option for Asia, Africa and South America
- Surfboards and SUPs have an additional £29.99 shipping cost. Due to a huge percentage which have arrived damaged we now only use reliable (more expensive) couriers
VAT (Tax) Free
If you live outside the EU or have a BFPO address, you are eligible for VAT free (20%) purchases so can save a lot of money. This is automatically deducted at checkout but please contact us if you would like further information. The prices shown on the website include VAT as standard until you enter your shipping country at the shipping Basket/Checkout page or are already logged in.
If for any reason you are unhappy with your purchase, you can return it to us in its original condition (with packaging and tags intact) within 14 days of the purchase date. We can either issue an in store credit for the item, send a different size or product if you would like an exchange or refund your payment.