O’Neill Psycho Tech 4/3+ Back Zip Men’s Wetsuit
$431.96 – $539.95Price range: $431.96 through $539.95
O’Neill has discontinued this back zip model. We love it for its simple entry and exit. Only one MT and LT sizes are left. Claim yours now!
O’Neill suits ship either from our Oregon shop (3-5 day transit time) or O’Neill’s warehouse (10-14 day transit time).
If your timeline is urgent, text us below for size-specific ETAs. Trust us, O’Neill gear is soooo worth the wait!
DESCRIPTION
- O’Neill’s Psycho Tech range focuses on ultimate warmth and durability with high-performance recycled materials and water-tight double-sealed stitchless seams. Sustainable TB4 Firewall technology radiates throughout with TB4 Duraskin Air Firewall in the chest and back to shield against the cold while retaining and recirculating your body heat. Designed to keep you in the water longer, toasty, and stoked.
KEY FEATURES
- Z.E.N. Zip Closure (Back Zip)
- Redzone Water Resistant Zipper
- Anti-Flush Barrier (Z.E.N. Zip)
- Super Seal Cuffs with Plasma Wrist and Ankle Seals
- Recycled Oyster Shells and Eco Carbon Black Infused Neoprene
- Recycled Dope-Dyed Yarn Jersey
- Aqua Alpha Solvent Free Neoprene Lamination
- Key Pocket with Loop
CONSTRUCTION
-
- Stitchless Exterior Fluid Seam Weld Technology with Interior Recycled TBX Tape
- Chest / Back: TB4 Duraskin Air Firewall
- Thigh / Butt / Shins / Calf: TB4 Firewall
- Arms / Shoulders: TechnoButter 4
- Entry: TechnoButter 4X
- PLUS (+) = 0.5mm Extra thickness for even more warmth
O’NEILL WETSUIT SIZE CHART

Only logged in customers who have purchased this product may leave a review.
Related products
Prolimit Mercury Steamer Free-X 6/4 Men’s Wetsuit 2026
Get the warmest suit without the hassle of a hood! Thermal Rebound technology keeps this suit 20% warmer without compromising the stretch.

Prolimit Predator FreeX 4/3 Men’s Wetsuit 2025
Glued and blind stitched seams.
Warm Down Airflex 550+ Natureprene.
A few Large sizes left!
Ships free in mainland U.S.

ION Protection Suit 3/2 SS Front Zip
Protective padding in the shoulders, back, shins, and privates.
Peace of mind for foilers, and beyond.
Ships free in mainland U.S.

What does this Gorge graphic mean?
Prolimit Mercury FreeX 4/3 Men’s Wetsuit 2024
O’Neill Hyperfreak Fire 3/2+ Chest Zip Full Mens Wetsuit 2026
Warmth that prompts questions. Namely, how can a wetsuit be this toasty and simultaneously so easy to forget that you're wearing it? TechnoButter4 materails are the answer. Updated Firewall and new fused super seal cuffs keep you even drier and warmer than before in this cold water legend! A staff favorite.
O’Neill suits ship either from our Oregon shop (3-5 day transit time) or O’Neill’s warehouse (10-14 day transit time).
If your timeline is urgent, text us below for size-specific ETAs. Trust us, O’Neill gear is soooo worth the wait!
O’Neill Heat 3/2 Back Zip Mens Wetsuit
Stuffed with high-end Technobutter materials, and kickers: It's easy to climb in and out of this suit, and it's available in tough-to-find plus sizes!
O’Neill suits ship either from our Oregon shop (3-5 day transit time) or O’Neill’s warehouse (10-14 day transit time).
If your timeline is urgent, text us below for size-specific ETAs. Trust us, O’Neill gear is soooo worth the wait!
O’Neill Hyperfreak 2MM Chest Zip Short Sleeve Full Wetsuit
A favorite among Gorge foilers for its full leg protection, and super flexible, lightweight fit. Surprisingly warm for a 2mm wetsuit!
O’Neill suits ship either from our Oregon shop (3-5 day transit time) or O’Neill’s warehouse (10-14 day transit time).
If your timeline is urgent, text us below for size-specific ETAs. Trust us, O’Neill gear is soooo worth the wait!
O’Neill Epic 3/2 Back Zip Men’s Wetsuit
A proven, reliable performer. The Epic utilizes durable UltraFlex DS Neoprene, and features a generous back zipper for easy entry and exit.
O’Neill suits ship either from our Oregon shop (3-5 day transit time) or O’Neill’s warehouse (10-14 day transit time).
If your timeline is urgent, text us below for size-specific ETAs. Trust us, O’Neill gear is soooo worth the wait!

Reviews
There are no reviews yet.