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O'neill Psycho One 5/4 bz

Regular price €400,00 Sale price €300,00 EUR
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Size guide

Size Guide

Men’s wetsuit sizes chart

Have a look at the wetsuit size chart below to find your ideal men’s wetsuit. If your measurements border on the top end of your chosen size, go for the next size up.

Men's wetsuit size

Height (cm)

Weight (kg)

Chest (cm)

Waist (cm)

2XS

168-173

52-59

90-93

70-72

XS

170-175

57-64

93-95

72-75

SS

166-171

59-68

95-99

75-79

S

173-178

61-70

95-99

75-79

ST

183-188

66-75

95-99

75-79

MS

169-174

66-75

99-104

79-84

M

175-180

70-77

99-104

79-84

MT

185-191

73-82

99-104

79-84

LS

171-177

73-82

104-110

84-89

L

178-183

77-86

104-110

84-89

LT

188-193

82-91

104-110

84-89

XLS

174-179

82-91

110-117

89-94

XL

180-185

86-95

110-117

89-94

XLT

191-196

91-100

110-117

89-94

2XL

183-188

95-104

117-123

94-99

3XL

183-191

104-113

123-130

99-112

4XL

185-193

113-122

130-136

112-122


Women’s wetsuit sizes chart

View the size chart below to find your ideal women’s wetsuit. If your measurements border on the top end of your chosen size, go for the next size up.

Women's wetsuit 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

6S

159-164

48-54

80-85

66-71

6

163-168

50-57

80-85

66-71

6T

166-171

52-59

80-85

66-71

8S

161-166

52-59

83-88

69-74

8

165-170

54-61

83-88

69-74

8T

169-174

57-64

83-88

69-74

10S

164-169

57-66

86-91

74-77

10

168-173

59-68

86-91

74-77

10T

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

 
Kids wetsuits size chart

Have a look at the wetsuit size chart below to find your ideal kids wetsuit. If the measurements of your child border on the top end of your chosen size, go for the next size up.

Kids wetsuits size

Length (cm)

Weight (kg)

Chest (cm)

Waist (cm)

1

88-98

11-13.5

48-53

45.5-51

2

98-108

13.5-16

51-56

48-53

3

108-118

16-18

53-58

51-56

4

118-126

18-25

58-64

51-56

6

126-133

22.5-29.5

62-67

55-60

8

133-141

27-34

66-71

58-64

10

141-147

34-41

71-76

58-64

12

147-155

41-48

74-79

64-69

14

155-163

48-54.5

79-84

69-74

16

163-170

54.5-61

84-89

71-76


The unparalleled premium in lightweight flexibility. With lightweight and hydrophobic TechnoButter 3 neoprene, this wetsuit is the one to have for high-performance surfing.

Wetsuits are often categorised by season, because the seasons are directly related to the temperature of the water. But of course, you can also choose the right wetsuit thickness by looking at the water temperature alone. Have a look at the chart below to get an idea of what thickness wetsuit you need at which water temperatures. Please note that this is just a guideline and other factors also play a role.

 

Wetsuit thickness women

Wetsuit thickness men

Wetsuit thickness kids

Temperature ()

UV shirt or Lycra

UV shirt or Lycra

UV shirt or Lycra

26+ ℃

1 mm wetsuits

1 mm wetsuits

1 mm wetsuits

21℃ - 25℃

2mm wetsuits or shorty

2mm wetsuits or shorty

2mm wetsuits or shorty

18℃ - 20℃

3/2mm wetsuits or 4/3mm wetsuits

3/2mm wetsuits or 4/3mm wetsuits

3/2mm wetsuits

12℃ - 17℃

4/3mm wetsuits or 5/4mm wetsuits

4/3mm wetsuits or 5/4mm wetsuits

4/3mm wetsuits

8℃ - 11℃

5/4mm wetsuits or 6/5mm wetsuits

5/4mm wetsuits or 6/5mm wetsuits

5/4mm wetsuits or 6/5mm wetsuits

4℃ - 7℃

7+ mm wetsuits

7+ mm wetsuits

7+ mm wetsuits

Below 3℃

 

 

Free shipping for orders from €75 in Belgium and the Netherlands. The estimated delivery time is 1 to 3 working days. We offer free returns within 14 working days, excluding any shipping costs.

Only 1 left in stock. Order soon.

Free delivery and shipping

Secure online payment

Free in-store pickup

  • Free delivery from €75
  • More than 10 years of experience
  • Free returns
  • Free delivery from €75
  • More than 10 years of experience
  • Free returns
  • Free delivery from €75
  • More than 10 years of experience
  • Free returns
  • Free delivery from €75
  • More than 10 years of experience
  • Free returns

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Frequently asked questions

How to clean your wetsuit?

The best (and easiest) way to clean your wetsuit is to rinse it with cold or lukewarm water after each surf. Make sure to rinse it on both sides until all sand, salt and dirt are gone. You can either wash it in the shower or dunk it in a large bucket of water. This helps to keep the neoprene stretchy and the zippers running smoothly. After washing your wetsuit with cold water, hang it on a hanger to drip dry. Use a horizontal hanger and fold the suit in half over the waistline. Always keep the wetsuit out of direct sunlight to prevent UV and ozone damage.

How to wash and clean your wetsuit?

After every session, you have to wash your wetsuit in order to get it fresh and ready for the next one. Apart from eliminating sand, salt, and odors, regular care will make your wetsuit last much longer. The good news is that washing your wetsuit isn’t that hard. In this blog article, we will tell you how to wash and care for your wetsuit, so you can enjoy it for longer and spend more time in the water!

1. Taking off
Avoid taking off your wetsuit while standing on gravel, grass or other rough surfaces. Instead, use the O’Neill Wetsuit Change Mat or lay down a towel to stand on.

2. Cleaning
Rinse your wetsuit in fresh, cold water and turn inside-out to dry in the shade lying flat. It is critical NOT to wash your wetsuit with hot water, dry it in the sunlight, or leave it in the boot of your car for long periods of time. Heat contact with neoprene affects the fabric’s flexibility and durability.

3. Drying
At home, hang your wetsuit on a wide plastic hanger (not wire) in a well-ventilated area; this will prevent deterioration and creases, do not fold.

How do I find the right size wetsuit?

Finding the right size wetsuit can be quite a challenge. It should fit like a second skin, tightly wrapped around your body. After all, a wetsuit only works when the fit is right. On the other hand, you don't want it to be too restrictive or tight, and want to avoid excess material in areas like your armpits, lower back and behind your knees. But don’t worry, we offer suits for every body type and gladly help you choose your correct wetsuit size. This makes wetsuit shopping a lot easier than before. Keep your measurements at hand, have a look at our wetsuit sizes guide and order the right size without having to try it on in a sandy fitting room!

As described above, it should fit tightly around the body. Only then, a thin layer of water can be trapped between the neoprene and your skin to keep your body warm. When the suit is too large and the material piles up in certain areas, cold water seeps in and runs through the suit (a phenomenon known as flushing). A wetsuit that is too small, however, is too tight and can restrict your freedom of movement in the water. This especially the case with winter wetsuits: the thicker the neoprene, the less flexible it is. When you try on your suit, you must be able to bend down and touch your toes, and move your arms and shoulders freely.

Tip: Remember that in addition to wetsuit sizes, wetsuit thicknesses are also very important!

O’Neill wetsuit sizes explained

Rather than on height, O’Neill wetsuit sizes are based on body types. While some are tall and slim, others have broad shoulders and a big chest, and yet another one is a bit heavier. Therefore, we do not only offer small, medium, large and extra large wetsuits, but multiple variants of each. SS (small small) for example, is a great fit for shorter persons with a relatively big waist and chest, while ST (small tall) is suited for taller persons that have the same waist and chest circumference. The normal S is the best choice for people who fall in between.

Wetsuit sizing tips: how to measure?

Not sure about your measurements and weight: here is how you measure them.

Height: stand right up and measure the length from the ground to the top
of your head.

Weight: measure your weight on a time of day you would normally go surfing. In the morning, you are usually lighter so don’t cheat.

Chest: keep your arms relaxed by your side and measure the widest part of your chest.

Waist: breathe out and measure around your natural waistline.

General guidelines for putting on a wetsuit

Even though different types of wetsuits have to be put on differently, there are some general guidelines that apply to all wetsuits. First off, it’s important to keep your suit in the best possible condition. In order to prevent damaging the neoprene, you should find a clean and flat surface to put your wetsuit on. Avoid standing on rocks, stones or other jagged surfaces. If there is no smooth surface available, you can use a changing mat to get changed. Your nails can also harm the neoprene, so use your fingertips instead. Another important thing is to make sure you have the right side facing forward. If you go wrong on this one, you have to start all over again!

Feet first!

Whatever wetsuit you want to put on, you should always start with your feet. Start with one foot, and pull up the leg over your calf. Meanwhile, make sure the cuff of the leg is positioned at the bottom of your ankle. Repeat these steps with your other leg and make sure the suit’s knees, which often have knee panels, are positioned on top of your knees. Then pull up the wetsuit to your waist. From here on, different methods are used for different suits.

How to put on a chest zipwetsuit?

Since it’s the most popular and common performance wetsuit, we will start to explain how to put on a chest zip wetsuit, also known as a front zip wetsuit or F.U.Z.E. When your wetsuit is pulled up to your waist, insert your right arm into the right sleeve. Then put your left arm in the left sleeve, and pull the entry flap over your head. Lastly, close the front zipper and attach the snap (if there is one).

Wondering how to put on a chest zip wetsuit? Check the video!
https://www.youtube.com/watch?v=8Kp2HkQomHs

How to put on a zipless wetsuit?

A back zip wetsuit is great for surfers with broad shoulders, because it has a larger entry than a front zip wetsuit. Once the suit is pulled up all the way to your waist, close the velcro closure to prevent it from sticking on other parts of your suit. Then insert your right arm into the right sleeve. If you lift your arm in the air, it’s easier to get the suit over your shoulder. Do the same with your left arm and make sure the suit sits well on your shoulders and under your arms. If your suit has a gaiter, such as O’Neill’s ZEN wetsuits, pull it over your head. Then grab the zip cord with one hand and close it with your other by pulling it up above your head. As the last step, close the velcro for a nice and snug fit.

Wondering how to put on a back zip wetsuit? Check the video!
https://www.youtube.com/watch?v=xDBr0CcvjZQ

more than 10 years experience

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Free delivery from €75 in Belgium and the Netherlands

More than 10 years of experience

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