Gilbert Men's Atomic X II Undershort Black

Name: Gilbert Men's Atomic X II Undershort Black
SKU: 815177SR
Availability: InStock

Earn 34 Reward Points

Men's Black Gilbert Atomic X II Undershort, with flat lock seams from O'Neills.

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Gilbert have developed a top quality pair of thermo undershorts, essential for any player in the toughest of conditions. The Atomic X Thermo II Undershorts, with a double sided fabric offering optimum thermal protection, assist with the circulation of body heat through the body with their compression fit. The Atomic X Thermo II Undershorts are made with flat lock seams, perfect for athletes constantly moving, with chafing prevention and to give the optimum comfort.

Size guide

These size charts should be used as a guide to determine the most suitable size. Please note, sizes and fit may vary between styles due to different cuts and fabrics being used.

Jerseys - Regular / Standard Fit - Adult

SIZE	Chest inch	Chest cm

Small	43-44	107-109.5
Medium	44-45	111-113.5
Large	46-47	115-117.5
X-Large	47-48	119-121.5
2XL	49-50	123.125.5
3XL	50-51	127-129.5
4XL	52-53	131-133.5
5XL	54-55	135-137.5
6XL	55-56	139-141.5
7XL	57-58	143-145.5

Jerseys - Player Fit - Adult

Player fit is a tighter fit jersey. It is usually 2-3 inches tighter around the arms and body compared to our regular fit jerseys. It is a more professional body hugging fit in the style worn by players on the pitch.

SIZE	Chest inch	Chest cm

Small	39-40	99-101.5
Medium	41-42	103-105.5
Large	43-44	107-109.5
X-Large	44-45	111-113.5
2XL	46-47	115-117.5
3XL	47-48	119-121.5

O'Neills - Mens/Unisex

Size	Chest		Waist
	inch	cm	inch	cm
XXS	34-35"	86-89	28-29"	71-73.5
XS	35-36"	89-91.5	29-30"	73.5-76
S	37-38"	94-96.5	31-32"	78-81
M	39-40"	99-101.5	33-34"	83-86
L	41-42"	104-107	35-36"	88-91.5
XL	43-44"	109-112	38-40"	96.5-102
2XL	45-46"	114-117	42-44"	106.5-111
3XL	47-48"	119-121	-	-
4XL	49-50"	123-125	-	-
5XL	51-52"	127-129	-	-

O'Neills - Mens/Unisex Inside Leg

Size	Regular		Skinny
	inch	cm	inch	cm
S	30-31"	78-80	30-31"	76-79
M	31-32"	79-81	30-31"	77-79
L	31-32"	79-81	30-31"	77-79
XL	31-32"	79-82	31-32"	77-81
2XL	31-32"	79-82	31-32"	77-81

Asics - Mens Clothing

Size	Chest cm	Waist cm	Hips cm

XS	80-88	67-75	79-87
S	88-96	75-83	87-95
M	96-104	83-91	95-103
L	104-113	91-100	103-111
XL	113-124	100-111	111-119
XXL	124-136	111-123	119-128
XXXL	136-148	123-135	128-138

Canterbury - Mens Tops

Size	Chest cm	Chest in

XS	86 - 91.5	34 - 36
S	94 - 99	37 - 39
M	99 - 104	39 - 41
L	104 - 109	41 - 43
XL	109 - 114.5	43 - 45
2XL	117 - 122	46 - 48
3XL	124.5 - 129.5	49 - 51
4XL	132 - 134.5	52 - 53

Canterbury - Mens Bottoms & Shorts

Size	Waist cm	Waist in

XS	71 - 76	28 - 30
S	76 - 81.5	30 - 32
M	81.5 - 86	32 - 34
L	86 - 91.5	34 - 36
XL	91.5 - 96.5	36 - 38
2XL	96.5 - 102	38 - 40
3XL	102 - 106.5	40 - 42
4XL	106.5 - 112	42 - 44

Castore - Mens

Size	Chest	Waist	Hips
	in	in	in
XS	36-38	28-30	32-34
S	38-40	30-32	34-36
M	40-42	32-34	36-38
L	42-44	34-36	38-40
XL	44-46	36-38	40-42
XXL	46-48	38-40	42-44
XXXL	48-50	40-42	44-46

Trespass - Mens Clothing

Size	Chest inch	Waist inch	Inside Leg

XS	33-35	28-30	29.5
S	35-37	30-32	30
M	38-40	33-35	30.5
L	41-43	36-38	31
XL	44-46	39-41	31.5
2XL	46-48	41-43	32
3XL	48-50	43-45	32.5

Under Armour - Mens Tops

SIZE	Chest inch	Waist inch

XS	30-32	26.5-27.5
S	34-36	28-29
M	38-40	30-32
L	42-44	34-36
XL	46-48	38-40
2XL	50-52	42-44
3XL	52-54	44-46
4XL	54-56	46-48
5XL	56-58	48-50

Under Armour - Mens Bottoms

SIZE	Waist inch	Hip inch

XS	26.5-27.5	32-33
S	28-29	34-35.5
M	30-32	37-38.5
L	34-36	40-42.5
XL	38-40	44-46
2XL	42-44	48-50
3XL	44-46	52-54
4XL	46-48	56-58
5XL	48-50	60-62

Jerseys - Regular / Standard Fit - Adult

SIZE	Chest inch	Chest cm

Small	43-44	107-109.5
Medium	44-45	111-113.5
Large	46-47	115-117.5
X-Large	47-48	119-121.5
2XL	49-50	123.125.5
3XL	50-51	127-129.5
4XL	52-53	131-133.5
5XL	54-55	135-137.5
6XL	55-56	139-141.5
7XL	57-58	143-145.5

Jerseys - Player Fit - Adult

SIZE	Chest inch	Chest cm

Small	39-40	99-101.5
Medium	41-42	103-105.5
Large	43-44	107-109.5
X-Large	44-45	111-113.5
2XL	46-47	115-117.5
3XL	47-48	119-121.5

Asics - Womens Clothing

Size	Chest cm	Waist cm	Hips cm

XXS	69-75	52-58	76-82
XS	75-82	58-65	82-89
S	82-89	65.72	89-96
M	89-96	72-79	96-103
L	96-104	79-87	103-111
XL	104-114	87-96	111-119
XXL	114-124	96-107	119-127

Canterbury - Womens Tops

Size	Chest cm	Chest in

6	75cm	30"
8	82cm	32"
10	87cm	34"
12	92cm	36"
14	97cm	38"
16	102cm	40"
18	107cm	42"

Canterbury - Womens Bottoms & Shorts

Size	Waist cm	Waist in	Hip cm	Hip in

6	55cm	22"	85cm	33"
8	62cm	24"	90cm	35"
10	67cm	26"	95cm	37"
12	72cm	28"	100cm	39"
14	77cm	30"	105cm	41"
16	82cm	32"	110cm	43"
18	87cm	34"	115cm	45"

Castore - Womens

Size	Chest	Waist	Hips
	in	in	in
XXS-6	31	24	34
XS-8	33	26	36
S-10	35	28	38
M-12	37	30	40
L-14	39	32	42
XL-16	41	34	44
2XL-18	43	36	46
3XL-20	45	38	48

Columbia - Womens Tops

Size	Bust in	Waist in	Hips in

XS	32-33	25.5-26.5	34.5-35.5
S	34-35	27.5-28.5	36.5-37.5
M	36-37.5	29.5-30.5	38.5-40
L	39-40	32-33.5	41.5-43
XL	42-44.5	35.5-37.5	45-47

Columbia - Womens Bottoms

Size	Waist in	Hips in

XS	25.5-26.5	34.5-35.5
S	27.5-28.5	36.5-37.5
M	29.5-30.5	38.5-40
L	32-33.5	41.5-43
XL	35.5-37.5	45-47

Speedo - Womens Swimwear

UK Size	Bust	Waist	Hip	Speedo Size
	cm	cm	cm
6	79-83	61-65	86-90	30
8	84-87	66-69	91-94	32
10	88-92	70-74	95-99	34
12	93-98	75-80	100-105	36
14	99-103	81-85	106-110	38
16	104-108	86-90	111-115	40

Speedo swimsuits are designed to have a close fit to your body to help you have the best swim. If you would like a looser fit you can go up a size..

O'Neills - Kids Leisurewear

Size	Chest		Waist
	inch	cm	inch	cm
5/6	25-26"	64-66	20-21"	51-53
7/8	27-28"	69-71	22-23"	56-58
9/10	29-30"	74-76	24-25"	61-64
10/11	31-32"	79-81	26-27"	66-69
13	34-36"	86-91	28-29"	71-74

Jerseys - Baby and Kids

SIZE	Chest inch	Chest cm

0-6 months	22-23	57-59.5
6-12 months	23-24	59-61.5
1-2	24-25	61-63.5
3-4	26-27	67-69.5
5-6	29-30	73-75.5
7-8	31-32	79-81.5
9-10	34-35	85-87.5
10-11	36-37	91-93.5
11-12	38-39	96-98.5
Age 13	40-41	101-103.5

Canterbury - Kids Tops

Size	Chest cm	Chest in

Age 6	58.5 - 61	23 - 24
Age 8	63.5 -66	25 - 26
Age 10	68.5 - 73.5	27 - 29
Age 12	76 - 81.5	30 - 32
Age 14	81.5 - 86	32 - 34

Canterbury - Kids Bottoms & Shorts

Size	Waist cm	Waist in

Age 6	56 - 58.5	22 - 23
Age 8	58.5 -61	23 - 24
Age 10	61 - 66	24 - 26
Age 12	66 - 71	26 - 28
Age 14	71 - 73.5	28 - 29

Castore - Kids

Size	Chest	Waist	Hips	Height
	cm	cm	cm	cm
JS (8-9)	66-69	61.5-65	71-74.5	128-137
JM (10-11)	69-75	65-69	74.5-79.5	137-147
JL (12-13)	75-81.5	69-72.5	79.5-84.5	147-158
JXL (14)	81.5-88.5	72.5-75.5	84.5-89.5	158-170

Columbia - Kids Bottoms

Size	Waist in	Inseam in	Age Range

XXS	21.5	18.75	5-6 Years
XS	22	21.25	7-8 Years
S	24.5	22	9-10 Years
M	26.5	26	11-12 Years
L	29.5	29	13-14 Years
XL	31	30	15-16 Years

Columbia - Kids Tops

Size	Chest in	Waist in	Age Range

XXS	23	21.5	4-5 Years
XS	25	22	6-7 Years
S	26.5	23.5	8-9 Years
M	29.5	25.5	10-11 Years
L	32.5	27.5	12-13 Years
XL	35.5	29.5	14-16 Years

Under Armour - Kids Tops

SIZE	Chest inch	Waist inch	Height inch

XS	25-26	22-23	48-50
S	26-28	23-24	50-54
M	28-30	25-26	54-59
L	30-32	26.27	59-63
XL	32-34	28-29	63-67

Under Armour - Kids Bottoms

SIZE	Waist inch	Hip inch	Height inch

XS	22-23	25-26	48-50
S	23-24	26.5-28	50-54
M	25-26	29-30.5	54-59
L	26-27	32-33.5	59-63
XL	28-29	35-36.5	63-67

ASICS - Kids Running Shoes

Ireland / UK	EU	CM	US

9 Infants	27	17	10 Junior
10 Junior	28.5	17.5	11 Junior
11 Junior	30	18.5	12 Junior
11.5 Junior	30.5	19	12.5 Junior
12 Junior	31.5	19.5	13 Junior
12.5 Junior	32	19.75	13.5 Junior
13 Junior	32.5	20	1 Youth
13.5 Junior	33	20.5	1.5 Youth
1 Youth	33.5	21	2 Youth
1.5 Youth	34.5	21.5	2.5 Youth
2 Youth	35	22	3 Youth
2.5 Youth	35.5	22.25	3.5 Youth
3 Youth	36	22.5	4 Youth
3.5 Youth	37	23	4.5 Youth
4 Youth	37.5	23.5	5 Youth
4.5 Youth	38	24	5.5 Youth
5 Youth	39	24.5	6 Youth
5.5 Youth	39.5	25	6.5 Youth
6 Youth	40	25.5	7 Youth

Skechers - Infant Footwear

Ireland / UK	Europe	US

1 Infants	17	2
2 Infants	18.5	3
3 Infants	19.5	4
4 Infants	20.5	5
4.5 Infants	21	5.5
5 Infants	21.5	6
5.5 Infants	22	6.5
6 Infants	22.5	7
6.5 Infants	23	7.5
7 Infants	24	8
7.5 Infants	25	8.5
8 Infants	25.5	9
8.5 Infants	26	9.5
9 Infants	26.5	10
9.5 Infants	27	10.5

Skechers - Kids Footwear

Ireland / UK	Europe	US
10 Junior	27.5	11
10.5 Junior	28	11.5
11 Junior	28.5	12
11.5 Junior	29	12.5
12 Junior	30	13
12.5 Junior	31	13.5
13 Junior	32	1
13.5 Junior	33	1.5
1 Junior	33.5	2
1.5 Junior	34	2.5
2 Junior	35	3
2.5 Junior	35.5	3.5
3 Youth	36	4
3.5 Youth	36.5	4.5
4 Youth	37	5
4.5 Youth	37.5	5.5
5 Youth	38	6
5.5 Youth	38.5	6.5
6 Youth	39	7

Under Armour - Kids Footwear

Inches	Ireland / UK	Euro	US youth

3 1/8	1.5 Infants	17.5	2K
3 1/2	2.5 Infants	18.5	3K
4	3.5 Infants	19.5	4K
4 1/4	4.5 Infants	21	5K
4 5/8	5.5 Infants	22	6K
5 1/8	6.5 Infants	23.5	7K
5 1/2	7.5 Infants	25	8K
5 3/4	8.5 Infants	26	9K
6 1/4	9.5 Infants	27	10K
6 5/8	10 Junior	27.5	10.5K
6 3/4	10.5 Junior	28	11K
7	11 Junior	28.5	11.5K
7 1/4	11.5 Junior	29.5	12K
7 1/3	12 Junior	30	12.5
7 5/8	12.5 Junior	31	13K
7 3/4	13.5 Junior	32	1
8	1 Junior	33	1.5
8 1/4	1.5 Junior	33.5	2
8 1/3	2 Junior	34	2.5
8 5/8	2.5 Junior	35	3
8 3/4	3 Youth	35.5	3.5
9	3.5 Youth	36	4
9 1/4	4 Youth	36.5	4.5
9 1/4	4.5 Youth	37.5	5
9 1/2	5 Youth	38	5.5
9 1/2	5.5 Youth	38.5	6
9 5/8	6 Youth	39	6.5

How to find your size

The tables provide sizing information with the product size displayed on one axis and the body measurements in inches and centimetres on the other. Find the measurements in the table which best match your body measurements to identify the most suitable size.

How to measure your body for clothing sizes

1. Chest

Hold one end of the tape measure at the fullest part of your chest or bust, using the other hand to guide it under your arms and along your back until it meets. Ensure the tape measure is flat the full way around and horizontal to the floor for an accurate measurement.

2. Waist

Place the tape measure on the narrowest part of your waist, wrapping it around until it meets. Refrain from holding the tape measure too tight as this will result in an inaccurate measurement.

3. Hips

Standing straight with your feet close together, locate the widest part of your hips and bottom. Place one end of the tape measure at the widest point, guiding the tape the full way around until it meets. Ensure the tape is parallel to the floor.

4. Inside Leg

Take your shoes off and stand with your feet flat on the ground. Place the tape measure at the top of the inner thigh and measure the distance to the ankle.

O’Neills sizing chart should be used as a guide only.

Not all garments are available in every size shown.

Measurements may vary depending on design of garment.

Composition: 92% Polyester, 8% Elastane

Australia from AU$10.99 - AU$24.99
We ship from both our Australian and Irish warehouses. Final shipping cost depends on item availability and origin.

New Zealand 2 days from dispatch AU$24.99

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SKU: 815177SR

https://www.oneills.com/au_en/gilbert-atomic-x-ii-undershort-adults-black.html 784791 Gilbert Men's Atomic X II Undershort Black https://www.oneills.com/media/catalog/product/8/1/815177.jpg 34 34 AUD InStock /Brands/Gilbert /Men/Men's Clothing/Men's Sport Shorts /Men/Men's Clothing/Base Layers /Men/Men's Clothing /Brands /Sports Equipment/Rugby Equipment /Gift Guide/Sports Equipment Gifts 6617 1483 1046 1042 5299 5980 7134 1 3 5299 1039 1042 5965 2932 <p>Gilbert have developed a top quality pair of thermo undershorts, essential for any player in the toughest of conditions. The Atomic X Thermo II Undershorts, with a double sided fabric offering optimum thermal protection, assist with the circulation of body heat through the body with their compression fit. The Atomic X Thermo II Undershorts are made with flat lock seams, perfect for athletes constantly moving, with chafing prevention and to give the optimum comfort.</p> <ul> <li>Composition: 92% Polyester, 8% Elastane</li> </ul> Gilbert real_product_type:Shorts gender:Men clubhub:No 784792 Gilbert Men's Atomic X II Undershort Black-Small 34 34 https://www.oneills.com/media/catalog/product/https://www.oneills.com/static/version0.0.0.302/frontend/Inchoo/oneills/en_AU/Magento_Catalog/images/product/placeholder/image.jpg OutOfStock Small 784793 Gilbert Men's Atomic X II Undershort Black-Medium 34 34 https://www.oneills.com/media/catalog/product/https://www.oneills.com/static/version0.0.0.302/frontend/Inchoo/oneills/en_AU/Magento_Catalog/images/product/placeholder/image.jpg OutOfStock Medium 784794 Gilbert Men's Atomic X II Undershort Black-Large 34 34 https://www.oneills.com/media/catalog/product/https://www.oneills.com/static/version0.0.0.302/frontend/Inchoo/oneills/en_AU/Magento_Catalog/images/product/placeholder/image.jpg OutOfStock Large 784795 Gilbert Men's Atomic X II Undershort Black-X-Large 34 34 https://www.oneills.com/media/catalog/product/https://www.oneills.com/static/version0.0.0.302/frontend/Inchoo/oneills/en_AU/Magento_Catalog/images/product/placeholder/image.jpg OutOfStock X-Large 855382 Gilbert Men's Atomic X II Undershort Black-X-Small 34 34 https://www.oneills.com/media/catalog/product/https://www.oneills.com/static/version0.0.0.302/frontend/Inchoo/oneills/en_AU/Magento_Catalog/images/product/placeholder/image.jpg OutOfStock X-Small 855383 Gilbert Men's Atomic X II Undershort Black-2XL 34 34 https://www.oneills.com/media/catalog/product/https://www.oneills.com/static/version0.0.0.302/frontend/Inchoo/oneills/en_AU/Magento_Catalog/images/product/placeholder/image.jpg InStock 2XL No Men Shorts Black Gilbert

Size	Neck in	Chest in	Sleeve in

XS	14-14.5	32-35	33
S	15-15.5	35-38	33
M	16-16.5	38-41	34
L	17-17.5	42-45	35
XL	18-18.5	46-49	36
XXL	19-19.5	50-53	37

UK Size	US Size	Euro Size

S	34-36	44-46
M	38-40	48-50
L	42-44	52-54
XL	46	56
2XL	48	58
3XL	50	60

Size	Waist in	Hips in

XS	26-29	32-34
S	29-32	35-37
M	32-35	38-40
L	36-39	41-43
XL	40-43	44-46
XXL	44-47	48-50

Speedo Size	Waist	Hip

24	24"	29.5"
26	26"	31.5"
28	28"	33.5"
30	30"	36.5"
32	32"	37.5"
34	34"	39.5"
38	38"	43.5"
40	40"	45.5"
42	42"	47.5"
44	44"	49.5"
46	46"	51.5"

Size	Waist	Hip

XXS	28"	33.5"
XS	30"	35.5"
S	32"	37.5"
M	34"	39.5"
L	36"	43.5"
XL	38"	43.5"
2XL	40"	45.5"
3XL	42"	47.5"

Ireland / UK	EU	CM	US

6	40	25.25	7
6.5	40.5	25.5	7.5
7	41.5	26	8
7.5	42	26.5	8.5
8	42.5	27	9
8.5	43.5	27.5	9.5
9	44	28	10
9.5	44.5	28.25	10.5
10	45	28.5	11
10.5	46	29	11.5
11	46.5	29.5	12
11.5	47	30	12.5
12	48	30.5	13
13	49	31	14

Ireland / UK	Europe	US

5.5	39	6.5
6	39.5	7
6.5	40	7.5
7	41	8
8	42	9
8.5	42.5	9.5
9	43	10
9.5	44	10.5
10	45	11
10.5	45.5	11.5
11	46	12
11.5	47	12.5
12	47.5	13
12.5	48	13.5
13	48.5	14

Ireland / UK	EU	US	Length cm

6	40	7	24.6
7	41	8	25.4
7.5	41.5	8.5	25.8
8	42	9	26.2
8.5	42.5	9.5	26.6
9	43	10	27.1
9.5	43.5	10.5	27.5
10	44	11	27.9
10.5	44.5	11.5	28.3
11	45	12	28.8
12	46	13	29.6
13	47	14	30.5

Inches	Ireland / UK	Euro	US Men

9 7/8	6	40	7
10	6.5	40.5	7.5
10 1/4	7	41	8
10 3/8	7.5	42	8.5
10 5/8	8	42.5	9
10 7/8	8.5	43	9.5
11	9	44	10
11 1/4	9.5	44.5	10.5
11 3/8	10	45	11
11 5/8	10.5	45.5	11.5
11 3/4	11	46	12
12	11.5	47	12.5
12 1/4	12	47.5	13
12 3/8	12.5	48	13.5
12 5/8	13	48.5	14

Size	Chest		Waist
	inch	cm	inch	cm
8	32"	81	26"	66
10	34"	86.5	28"	71
12	36"	91	30"	76
14	38"	97	32"	81
16	40"	102	34"	86
18	42"	107	36"	91.5

Size	Waist	Inside Leg
	inch	cm
Size 6	24	8
Size 8	26	9.5
Size 10	28	10.5
Size 12	30	11.5
Size 14	32	11.5
Size 16	34	11.5
Size 18	36	11.5
Size 20	38	11.5

Size	UK	Bust inch	Waist inch	Inside Leg

XXS	6	31	26	28.5
XS	8	32	27	29
S	10	34	28	30
M	12	36	30	30.25
L	14	38	32	30.5
XL	16	40	34	31

SIZE	Bust inch	Waist inch

XS	31-33	23-25
S	33.5-35.5	25.5-27.5
M	36-38	28-30
L	38.5-40.5	30.5-32.5
XL	41-43	33-35

Ireland / UK	EU	CM	US

3	35.5	22.5	5
3.5	36	22.75	5.5
4	37	23	6
4.5	37.5	23.5	6.5
5	38	24	7
6	39.5	25	8
6.5	40	25.5	8.5
7	40.5	25.75	9
7.5	41.5	26	9.5
8	42	26.5	10
8.5	42.5	27	10.5
9	43.5	27.5	11

Ireland / UK	Europe	US

3	36	6
3.5	36.5	6.5
4	37	7
4.5	37.5	7.5
5	38	8
5.5	38.5	8.5
6	39	9
6.5	39.5	9.5
7	40	10
7.5	40.5	10.5
8	41	11
9	42	12
10	43	13

Inches	Ireland / UK	Euro	US Women

8 3/4	2.5	35.5	5
8 7/8	3	36	5.5
9 1/8	3.5	36.5	6
9 1/4	4	37.5	6.5
9 3/8	4.5	38	7
9 5/8	5	38.5	7.5
9 3/4	5.5	39	8
10	6	40	8.5
10 1/8	6.5	40.5	9
10 3/8	7	41	9.5
10 5/8	7.5	42	10
10 3/4	8	42.5	10.5

UK Size	US Size	Euro Size

5/6	6	110-116
7/8	7/8	122-128
9/10	10	134-140
10/11	11	140-146
13	13	146-154

Age	Chest	Waist	Hips	Speedo Size

4-5	22"	21"	23"	22
5-6	24"	22"	25"	24
7-8	26"	23"	27.5"	26
9-10	28.5"	24.5"	30"	28
11-12	30.5"	25.5"	33"	30
13-14	33"	27"	35.5"	32
15-16	36.5"	29"	38"	34

Size	Height	Chest

6-9mths	29-31"	20.5"
9-12mths	31-33"	21"
2yrs	36"	22"
3yrs	39"	23"
4yrs	43"	23.5"
5yrs	45"	24.5"
6yrs	47"	25"

Age	Chest	Waist	Hips	Speedo Size

4-5	21.5"	21"	23.5"	22
5-6	23.5"	23"	25.5"	24
7-8	25.5"	24"	27.5"	26
9-10	28"	26"	29.5"	28
11-12	30.5"	28"	32"	30
13-14	33"	30"	34.5"	32
15-16	36"	32"	37"	34

Age	Height	Waist	Speedo Size

4-5yrs	41"	22	XS
6-7yrs	46"	24"	S
8-9yrs	50.5"	26"	M
10-11yrs	55"	28"	L
12-13yrs	60"	30"	XL
13-14yrs	60"	30"	XXL
15+yrs	69"	34"	XXXL

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Gilbert Men's Atomic X II Undershort Black

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How to measure your body for clothing sizes

Size	Height	Chest

6-9mths	29-31"	19.5"
9-12mths	31-33"	20.5"
2yrs	36"	21"
3yrs	39"	21.5"
4yrs	43"	22"
5yrs	45"	22.5"
6yrs	47"	23"