O'Neill Psycho Tech 5mm+ ST Booties-Black View full product details

O'Neill Psycho Tech 5mm+ ST Booties-Black

Name: O'Neill Psycho Tech 5mm+ ST Booties-Black
Rating: 5.00 (1 reviews)

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191015156445

$134.95

$134.95 $134.95

Size 9 10 11 12 7 8 13

O'Neill Size Guide

Select a category to view sizing information.

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"

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"

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"

Metric Size Chart

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

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"

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"

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

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"

Metric Size Chart

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

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"

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"

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"

Metric Size Chart

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

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"

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"

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

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"

Delivery Free Shipping

Available on orders of $100 or more. Excludes boards and oversized items.

Shipping details Extended holiday returns Return through Jan. 24, 2027

Eligible purchases Nov. 6–Dec. 24, 2026. Exclusions apply.

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$94.95

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From O’Neill

The redesigned Psycho Tech is our most advanced boot, with an O'Ring entry and liquid-sealed Sidewinder seams for superior watertight performance. Our heat-retaining TB4 materials and rugged Krypto Armor enhance comfort, warmth, and durability while preventing overexpansion. A wrap-under arch segment pairs up with our high-performance All-Terrain Mudder Grip for improved stability. Built for the harshest conditions.

Anatomical Fit
Split-Toe for Improved Stability
Wrap Under Arch Foxing Segment for Improved Structure and Torsion Control
Extended Foxing Coverage for Enhanced Durability and Grip
Heel Lock Instep Strap
Tapered Entry with O'Ring Seal
Easy Entry Heel Pull Tab
AT-Mudder Grip Sole for Slip-Free Performance
Construction
Fluid Seam Weld with Fully TBX Taped Seams
Shin: TechnoButter 4
Instep, Heel: TB4 Krypto Armor Firewall
Sole: TB4 Firewall
Multi-Layered Foxing
PLUS (+) = 0.5mm Extra thickness for even more warmth

Recommended for you

5 stars: 1 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

Best winter boots

Great experience with these boots this winter. The material has some stretch making them easy to get on, but keeps the fit really snug. Always looking for the boot with the tightest fit and eliminates any room for water to sit around. I am impressed with the fit and warmth. Lots of days with water in the low 40's this winter and these 5mm boots were great. Highly recommend.

O'Neill Psycho Tech 5mm+ ST Booties-Black

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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"

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"

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"

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"

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"

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"