O'Neill Psycho Tech 4/3+ BZ Wetsuit-Blk/Blk
Body measurements in inches.
| Alpha | Numeric | Chest | Waist | Hips |
|---|---|---|---|---|
| SM | 28 | 36–37" | 30" | 36" |
| SM | 29 | 36–37" | 31" | 37" |
| SM | 30 | 36–37" | 32" | 38" |
| MD | 31 | 38–39" | 33" | 39" |
| MD | 32 | 38–39" | 34" | 40" |
| LG | 34 | 41–43" | 36" | 42" |
| LG | 36 | 41–43" | 38" | 44" |
| XL | 38 | 45–47" | 40" | 46" |
| XL | 40 | 45–47" | 42" | 48" |
| XXL | 42 | 49–51" | 44" | 50" |
| XXL | 44 | 49–51" | 46" | 52" |
| XXXL | — | 53–55" | 48–50" | 54–56" |
Body measurements in inches.
| Size | Waist | Hip |
|---|---|---|
| 28 | 28" | 36" |
| 29 | 29" | 37" |
| 30 | 30" | 38" |
| 31 | 31" | 39" |
| 32 | 32" | 40" |
| 33 | 33" | 41" |
| 34 | 34" | 42" |
| 36 | 36" | 44" |
| 38 | 38" | 46" |
| 40 | 40" | 48" |
| 42 | 42" | 50" |
| 44 | 44" | 52" |
Body measurements in inches.
| Size | Height | Weight (lbs) | Chest | Waist |
|---|---|---|---|---|
| XS | 5'7"–5'9" | 125–140 | 36.5–37.5" | 28.5–29.5" |
| S | 5'8"–5'10" | 135–155 | 37.5–39" | 29.5–31" |
| MS | 5'6.5"–5'8.5" | 145–165 | 39–41" | 31–33" |
| M | 5'9"–5'11" | 155–170 | 39–41" | 31–33" |
| MT | 6'1"–6'3" | 160–180 | 39–41" | 31–33" |
| LS | 5'7.5"–5'9.5" | 160–180 | 41–43" | 33–35" |
| L | 5'11"–6'1" | 170–190 | 41–43" | 33–35" |
| LT | 6'2"–6'4" | 180–200 | 41–43" | 33–35" |
| XLS | 5'8.5"–5'10.5" | 180–200 | 43–45" | 35–37" |
| XL | 6'0"–6'2" | 190–210 | 43–45" | 35–37" |
| XLT | 6'3"–6'5" | 200–220 | 43–45" | 35–37" |
| XXLS | 5'9.5"–5'11.5" | 200–220 | 45–47" | 37–39" |
| XXL | 6'1"–6'3" | 210–230 | 45–47" | 37–39" |
| XXXL | 6'2"–6'4" | 230–250 | 47–49" | 39–44" |
| Size | Height (cm) | Weight (kg) | Chest (cm) | Waist (cm) |
|---|---|---|---|---|
| XS | 170–175 | 57–64 | 93–95 | 72–75 |
| S | 173–178 | 61–70 | 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 | 172–177 | 73–82 | 104–109 | 84–89 |
| L | 180–185 | 77–86 | 104–109 | 84–89 |
| LT | 188–193 | 82–91 | 104–109 | 84–89 |
| XLS | 175–179 | 82–91 | 109–114 | 89–94 |
| XL | 183–188 | 86–95 | 109–114 | 89–94 |
| XLT | 191–196 | 91–100 | 109–114 | 89–94 |
| XXLS | 177–182 | 91–100 | 114–119 | 94–99 |
| XXL | 185–191 | 95–104 | 114–119 | 94–99 |
| XXXL | 188–193 | 104–113 | 119–124 | 99–112 |
Body measurements in inches.
| Size | Bust | Waist | Hip |
|---|---|---|---|
| XS (0-1) | 32–33" | 24–25" | 34–35" |
| S (3-5) | 34–35" | 26–27" | 36–37" |
| M (7-9) | 36–37" | 28–29" | 38–39" |
| L (11-13) | 38.5–40" | 30.5–32" | 40.5–42" |
| XL (15) | 41.5" | 33.5" | 43.5" |
Body measurements in inches.
| Size | Waist | Hip | Inseam |
|---|---|---|---|
| 24 | 24" | 35" | 27" |
| 25 | 25" | 36" | 27" |
| 26 | 26" | 37" | 27" |
| 27 | 27" | 38" | 27" |
| 28 | 28" | 39" | 27" |
| 29 | 29" | 40" | 27" |
| 30 | 30" | 41" | 27" |
| 31 | 31" | 42" | 27" |
| 32 | 32" | 43" | 27" |
Body measurements in inches.
| Size | Bust | Waist | Hip | US Cup |
|---|---|---|---|---|
| XS | 32–33" | 24–25" | 34–35" | A |
| S | 34–35" | 26–27" | 36–37" | A–B |
| M | 36–37" | 28–29" | 38–39" | B–C |
| L | 38.5–40" | 30.5–32" | 40.5–42" | C–D |
| XL | 41.5" | 33.5" | 43.5" | D |
Body measurements in inches.
| Size | Height | Weight (lbs) | Chest | Waist | Hip |
|---|---|---|---|---|---|
| 2 | 5'1"–5'3" | 90–105 | 30.5–31.5" | 24–25" | 34.5–35.5" |
| 4 | 5'3"–5'5" | 100–115 | 31.5–32.5" | 25–26" | 35.5–36.5" |
| 6S | 5'2"–5'4" | 105–120 | 32.5–34" | 26–27.5" | 36.5–38" |
| 6 | 5'4"–5'6" | 110–125 | 32.5–34" | 26–27.5" | 36.5–38" |
| 6T | 5'6"–5'8" | 115–130 | 32.5–34" | 26–27.5" | 36.5–38" |
| 8S | 5'3"–5'5" | 115–130 | 34–35.5" | 27.5–29" | 38–39.5" |
| 8 | 5'5"–5'7" | 120–135 | 34–35.5" | 27.5–29" | 38–39.5" |
| 8T | 5'7"–5'9" | 125–140 | 34–35.5" | 27.5–29" | 38–39.5" |
| 10S | 5'4"–5'6" | 125–140 | 35.5–37" | 29–30.5" | 39.5–41" |
| 10 | 5'6"–5'8" | 130–145 | 35.5–37" | 29–30.5" | 39.5–41" |
| 12 | 5'7"–5'9" | 135–155 | 37–38.5" | 30.5–32" | 41–42.5" |
| 14 | 5'9"–5'11" | 145–165 | 38.5–40" | 32–33.5" | 42.5–44" |
| 16 | 5'10"–6'0" | 155–175 | 40–41.5" | 33.5–35" | 44–45.5" |
| Size | Height (cm) | Weight (kg) | Chest (cm) | Waist (cm) | Hip (cm) |
|---|---|---|---|---|---|
| 2 | 155–160 | 41–48 | 77–80 | 61–64 | 88–90 |
| 4 | 160–165 | 45–52 | 80–83 | 64–66 | 90–93 |
| 6S | 157–162 | 48–54 | 83–86 | 66–70 | 93–97 |
| 6 | 163–168 | 50–57 | 83–86 | 66–70 | 93–97 |
| 6T | 168–173 | 52–59 | 83–86 | 66–70 | 93–97 |
| 8S | 160–165 | 52–59 | 86–90 | 70–74 | 97–100 |
| 8 | 165–170 | 54–61 | 86–90 | 70–74 | 97–100 |
| 8T | 170–175 | 57–64 | 86–90 | 70–74 | 97–100 |
| 10S | 163–168 | 57–64 | 90–94 | 74–77 | 100–104 |
| 10 | 168–173 | 59–66 | 90–94 | 74–77 | 100–104 |
| 12 | 170–175 | 61–70 | 94–98 | 77–81 | 104–108 |
| 14 | 175–180 | 66–75 | 98–102 | 81–85 | 108–112 |
| 16 | 178–183 | 70–79 | 102–106 | 85–89 | 112–116 |
Body measurements in inches.
| Size | Bust | Waist | Hip |
|---|---|---|---|
| XS | 32–33" | 24–25" | 34–35" |
| S | 34–35" | 26–27" | 36–37" |
| M | 36–37" | 28–29" | 38–39" |
| L | 38.5–40" | 30.5–32" | 40.5–42" |
| XL | 41.5" | 33.5" | 43.5" |
Body measurements in inches.
| Size | Chest | Waist |
|---|---|---|
| XS | 34–36" | 28–30" |
| S | 36–38" | 30–32" |
| M | 38–40" | 32–34" |
| L | 40–42" | 34–36" |
| XL | 42–44" | 36–38" |
| 2XL | 44–46" | 38–40" |
Body measurements in inches.
| Size | Height | Weight (lbs) | Chest | Waist |
|---|---|---|---|---|
| 4 | 3'10"–4'1" | 35–45 | 23" | 21" |
| 6 | 4'1"–4'4" | 40–55 | 24" | 22" |
| 8 | 4'4"–4'7" | 50–65 | 26" | 23" |
| 10 | 4'7"–4'10" | 60–75 | 27.5" | 24" |
| 12 | 4'10"–5'1" | 70–85 | 29" | 25" |
| 14 | 5'1"–5'4" | 80–100 | 30.5" | 26" |
| 16 | 5'4"–5'7" | 90–115 | 32" | 27" |
| Size | Height (cm) | Weight (kg) | Chest (cm) | Waist (cm) |
|---|---|---|---|---|
| 4 | 117–124 | 16–20 | 58 | 53 |
| 6 | 124–132 | 18–25 | 61 | 56 |
| 8 | 132–140 | 23–30 | 66 | 58 |
| 10 | 140–147 | 27–34 | 70 | 61 |
| 12 | 147–155 | 32–39 | 74 | 64 |
| 14 | 155–163 | 36–45 | 78 | 66 |
| 16 | 163–170 | 41–52 | 81 | 69 |
Body measurements in inches.
| Size | Height | Weight (lbs) | Chest | Waist |
|---|---|---|---|---|
| XS (6/7) | 46–49" | 47–53 | 25" | 22" |
| S (8) | 50–53" | 54–63 | 26.5" | 23" |
| M (10/12) | 54–57" | 64–75 | 28" | 24" |
| L (14/16) | 58–61" | 76–87 | 30" | 25" |
| XL (18/20) | 62–65" | 88–110 | 32" | 26" |
Body measurements in inches.
| Size | Height | Weight (lbs) | Chest | Waist | Hip |
|---|---|---|---|---|---|
| XS (6/7) | 46–49" | 47–53 | 25" | 22" | 26" |
| S (8) | 50–53" | 54–63 | 26.5" | 23" | 27.5" |
| M (10/12) | 54–57" | 64–75 | 28" | 24" | 29" |
| L (14/16) | 58–61" | 76–87 | 30" | 25" | 31" |
| XL (18/20) | 62–65" | 88–110 | 32" | 26" | 33" |
Use your US Men's/Women's shoe size.
| US Men's | US Women's | EU | UK |
|---|---|---|---|
| 4 | 5 | 36 | 3.5 |
| 5 | 6 | 37 | 4.5 |
| 6 | 7 | 38/39 | 5.5 |
| 7 | 8 | 40 | 6.5 |
| 8 | 9 | 41 | 7.5 |
| 9 | 10 | 42 | 8.5 |
| 10 | 11 | 43/44 | 9.5 |
| 11 | 12 | 45 | 10.5 |
| 12 | 13 | 46 | 11.5 |
| 13 | 14 | 47/48 | 12.5 |
| 14 | 15 | 49 | 13.5 |
Measure the circumference of your hand around the knuckles (excluding the thumb).
| Size | Hand Circumference |
|---|---|
| XS | 6.5–7" |
| S | 7–7.5" |
| M | 7.5–8" |
| L | 8–8.5" |
| XL | 8.5–9" |
| 2XL | 9–9.5" |
Available on orders of $100 or more. Excludes boards and oversized items.
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Located in Cape Hatteras. No bots.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.
O’Neill is a pioneering surf brand that helped define modern surfing—innovating everything from the first wetsuit to today’s high-performance gear built for comfort, durability, and progression in the water.
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