O'Neill Womens Psycho Tech 5/4 Chest Zip Wetsuit

Regular price €360.00 Sale price €252.00 Save €108.00
Shipping calculated at checkout.

Size Guide

O'Neill Women's Wetsuit Size Guide (US Sizing)
The size in the first column of the size chart corresponds to the US sizing in the product. For example Size 8 is US 8 / UK 10.

Metric sizing

Size Height (cm) Weight (kg) Chest (cm) Waist (cm)
2 155-160 41-48 76-81 62-67
4 160-165 45-52 77-83 64-69
6 Short 159-164 48-54 80-85 66-71
6 163-168 50-57 80-85 66-71
6 Tall 166-171 52-59 80-85 66-71
8 Short 161-166 52-59 83-88 69-74
8 165-170 54-61 83-88 69-74
8 Tall 169-174 57-64 83-88 69-74
10 Short 164-169 57-66 86-91 74-77
10 168-173 59-68 86-91 74-77
10 Tall 171-177 61-70 86-91 74-77
12 170-175 64-73 90-95 77-81
14 173-178 68-77 94-99 79-85
16 175-180 75-84 98-103 85-89

Imperial sizing

Size Height (in) Weight (lb) Chest (in) Waist (in)
2 5'1"-5'3" 90-105 30-32 24½-26½
4 5'3"-5'5" 100-115 30½-32½ 25-27
6 Short 5'2"-5'4½" 105-120 31½-33½ 26-28
6 5'4"-5'6" 110-125 31½-33½ 26-28
6 Tall 5'5½"-5'7½" 115-130 31½-33½ 26-28
8 Short 5'3½"-5'5½" 115-130 32½-34½ 27-29
8 5'5"-5'7" 120-135 32½-34½ 27-29
8 Tall 5'6½"-5'8½" 125-140 32½-34½ 27-29
10 Short 5'4½"-5'6½" 125-145 34-36 29-30½
10 5'6"-5'8" 130-150 34-36 29-30½
10 Tall 5'7½"-5'9½" 135-155 34-36 29-30½
12 5'7"-5'9" 140-160 35½-37½ 30½-32
14 5'8"-5'10" 150-170 37-39 31-33½
16 5'9"-5'11" 165-185 38½-40½ 33½-35

O’Neill’s PsychoTech combines our exclusive TechnoButter 3 neoprene with TechnoButter Air Firewall insulation, Single Fluid Seam Weld and a F.U.Z.E. Closure Sytem. Lighter, warmer, more insulating and quick drying with improved ease of entry. PsychoTech is the latest advancement in cold water wetsuit technology from the leaders in innovation for over 60 years.

  • 5/4mm
  • Lumbar Seamless Design (LSD)
  • Plasma wrist & ankle seals
  • Integrated Hood
  • Washing instruction: Rinse with cool water and drip dry out of direct sunlight


O'Neill's exclusive new pre-stretched neoprene with featherlight, ENVY foam rubber core. Ultimate, flexibility, warmth and comfort. Built to last.


O’NEILL’S EXTERIOR FLUID SEAM WELD is a revolutionary seam construction that utilizes 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.


A toasty warm two layer design featuring a 360˚ smooth skin interior lining, wide adjustablility, and a secure lock down. Fully adjustable and watertight.


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.


Abrasion resistant, high stretch neoprene panel with ergonomic shaping for comfortable durability. Flexible and unique design utilizes and extended knee pad for added durability.


A bonded low profile cuff seal that keeps water out. The ultimate seal and durability. O'Neill's Super seal cuff is fused to create a very low profile at the cuff ending creating the best seal ever.


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.


Available in (SL) Single lined & (DL) Double lined. Identical features to TechnoButter with the addition of air technology. TechnoButter Air technology is a complex 3D structure of neoprene and trapped air. Think double pane windows, more air = more warmth. The TechnoButter Firewall inner lining is 20% Lighter and has 30% less water absorption resulting in the warmest, lightest and fastest drying material available.


    Returns (online purchases)

    Not in love or not the right size?

    You can return your item within 14 days of receiving your order and we will refund you or if you prefer, you can exchange it for a different item (we cannot always accommodate exchanges, please contact us before you send an item back).

    Return shipping is paid by the customer and shipping charges for exchange items apply and are due before an exchange item is being shipped.

    How to return an item that you purchased online

    For peace of mind we recommend to use a tracked/'signed for' delivery service. Refunds/Exchanges will be processed once we have made sure that the item is unused, in its original packaging, with all tags still in place and in resalable condition. Please note that you need to notify us of your return within 14 days of receiving your order. You then have another 14 days to send back the item/s. Returns that are made after 14 days will result in us not accepting the return/refund.

    If you would like to return an item, please email us. You can send returns to our shop address in the Grand Canal Dock, Dublin 4.

    Gift Vouchers cannot be returned or refunded.

    Wrong or faulty item? 

    If you have just opened your parcel and think that the item is faulty or that the wrong item was delivered, please contact us immediately at by email or phone on 01-6683945 and we are happy to help. 

    This does not affect your statutory rights.

    Covid 19 Level 5 Restrictions - Our premises are closed but our online orders are shipping as normal.

    Returns (in-store purchases)

    If you have purchased your item in our Dublin store, you can return your item within 7 days of date of purchase in exchange for a different item in-store or for a credit note. We do not offer cash refunds for returns of in-store purchases. Exchanges/Credit Notes will be processed once we have made sure that the item is unused, in its original packaging and with all tags still in place. Please note that items that are returned later than 7 days will result in us not accepting the return.

    Covid-19: Our online orders are being shipped as normal every business day. Please expect slight delays to delivery times due to the high volume the couriers are dealing with currently. Click & Collect is temporarily disabled in line with government restrictions. 


    We currently ship orders to the EU and UK(GB Shipping Suspended due to Covid Restrictions). We offer same day shipping for in stock items if an order is placed before 12pm. Orders placed after 12pm will be shipped on the next business day.

    Your order value is the total calculated at checkout and you will be able to see your delivery charge before you complete the checkout process. If your order qualifies for free shipping, you will be given this option at checkout.

    Republic of Ireland

    Orders are shipped with Fastway Courier. 

    Order Value up to €99.99 costs €6.95
    Order Value over €100 gets free shipping

    Usually 2-3 business days*  (please expect delays due to Covid-19) Next collection date is now 29th December.

    3 Day Shipping Option with DHL Express: €11.95 (in stock items only, excludes bulky items)

    DHL Orders are taking longer before Christmas - now 3 day delivery. Place your order before 12:00 noon Monday to Friday for 3 day shipping with DHL. Orders placed after 12:00 noon on Friday and on weekends will be shipped on Monday and delivered on Thursday. (unless the Monday is a bank holiday when they will be shipped on the Tuesday). No shipping on weekends or bank holidays.

     Shipping times are provided by or shipping partners, and are not guaranteed. 

    Northern Ireland

    Orders are shipped with Fastway Courier. 

    Order Value up to €99.99 costs €6.95
    Order Value over €100 gets free shipping

    Usually 2-3 business days*  (please expect delays due to Covid-19)


    Great Britain

    Orders are shipped with Fastway Courier.

    Order Value up to €99.99 costs €14.76
    Order Value over €100 gets free shipping

    Usually 3-4 business days*  (please expect delays due to Covid-19)

    EU Countries (Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Rep, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Luxembourg, Malta, Monaco, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden)

    Orders are shipped with DHL Express

    Order Value up to €199.99 costs €29.95
    Order Value over €200 gets free shipping

    Usually 1-5 business days to most locations. Please contact us for Saturday delivery or Express shipping options.*  (please expect delays due to Covid-19)

    Bulky Items

    Some items may be excluded from shipping to certain locations like surfboards and surfboard bags. Other bulky items may be available to ship at a higher charge than regular shipping rates. It will show at checkout if an item cannot be shipped. If that is the case, please feel free to contact us as we might be able to get you a custom quote for delivery. 

    *Shipping times are guidelines only and cannot be guaranteed. We will send you tracking details once your order has been shipped.