Men’s Swimwear & Boardshorts Sizing & Measurement Matrix

Comprehensive reference matrix mapping men’s swim trunks, boardshorts, and swim briefs against relaxed-to-stretched waist ranges, hip girth contouring, thigh clearances, style tiers, and fit classifications.

Men’s Swimwear Standard Specifications

Detailed breakdown of standardized sizing labels, relaxed and stretched waist intervals, hip girths, thigh clearances, style categories, and fit types for men’s swimwear.

United States	Europe	United Kingdom	Italy	France	Australia	Japan	South Korea	China	Brazil	Mexico	International	Relaxed Waist ( $\text{cm}$ )	Relaxed Waist ( $\text{in}$ )	Stretched Waist ( $\text{cm}$ )	Stretched Waist ( $\text{in}$ )	Hip Girth ( $\text{cm}$ )	Hip Girth ( $\text{in}$ )	Thigh Clearance ( $\text{cm}$ )	Thigh Clearance ( $\text{in}$ )	Swimwear Style / Cut	Fit Category
XS (26–28)	40–42	26–28	42	36	XS	S	85	165/70A	34	26–28	XS	66	26	71	28	84	33	50	19.7	Swim Briefs & Slim Trunks	Athletic Snug Fit
S (28–30)	44	28–30	44	38	S	M	90	170/74A	36	28–30	S	71	28	76	30	89	35	53	20.9	Trunks, Briefs & Boardshorts	Slim Contour Fit
M (31–33)	46–48	31–33	46	40	M	L	95	175/78A	38	31–33	M	78.7	31	83.8	33	96.5	38	57	22.4	Mid-Thigh Trunks & Boardshorts	Classic Regular Fit
L (34–36)	50–52	34–36	48	42	L	XL	100	180/84A	40	34–36	L	86.4	34	91.4	36	104	41	61	24	Trunks, Boardshorts & Shorts	Relaxed Comfort Fit
XL (38–40)	54–56	38–40	50	44	XL	3L	105	185/90A	42	38–40	XL	96.5	38	101.6	40	111.8	44	65	25.6	Relaxed Swim Trunks & Shorts	Generous Full Fit
2XL (42–44)	58–60	42–44	52	46	2XL	4L	110	190/96A	44	42–44	2XL	106.7	42	111.8	44	119.4	47	69	27.2	Extended Comfort Swim Trunks	Extended Plus Fit
3XL (46–48)	62–64	46–48	54	48	3XL	5L	115	195/102A	46	46–48	3XL	116.8	46	121.9	48	127	50	73	28.7	Big & Tall Boardshorts & Trunks	Big & Tall Fit

* Sizing can vary significantly between international brands and regional manufacturers. Use this matrix as a baseline reference for standard proportional conversions.

Interpreting Men’s Swimwear Dimensions

Standardizing men’s swimwear requires correlating regional size labels with precise elastic stretch measurements, including relaxed static waistbands, maximum functional stretch limits, glute/hip girth contours, and thigh opening clearances. Because swimwear fit depends heavily on fabric recovery and cut style—ranging from performance briefs and square-cut trunks to elastic boardshorts—sizing spans across global standards including US, UK, EU, French, Italian, and Australian formats.

When utilizing this matrix for swimwear selection or international size conversion, cross-reference your body measurements against the listed waist elasticity ranges, hip contours, and style tiers to ensure secure comfort during aquatic activities.

Indexed Sizing Tiers & Dimensions

XS (26–28)Size

Waist: 66–71 cm (26″–28″), Hip: 84 cm (33″), Style: Swim Briefs & Slim Trunks, Fit: Athletic Snug Fit mapping for US size XS (26–28)

Symbol: XS (26–28)Base Value: 66

S (28–30)Size

Waist: 71–76 cm (28″–30″), Hip: 89 cm (35″), Style: Trunks, Briefs & Boardshorts, Fit: Slim Contour Fit mapping for US size S (28–30)

Symbol: S (28–30)Base Value: 71

M (31–33)Size

Waist: 78.7–83.8 cm (31″–33″), Hip: 96.5 cm (38″), Style: Mid-Thigh Trunks & Boardshorts, Fit: Classic Regular Fit mapping for US size M (31–33)

Symbol: M (31–33)Base Value: 78.7

L (34–36)Size

Waist: 86.4–91.4 cm (34″–36″), Hip: 104 cm (41″), Style: Trunks, Boardshorts & Shorts, Fit: Relaxed Comfort Fit mapping for US size L (34–36)

Symbol: L (34–36)Base Value: 86.4

XL (38–40)Size

Waist: 96.5–101.6 cm (38″–40″), Hip: 111.8 cm (44″), Style: Relaxed Swim Trunks & Shorts, Fit: Generous Full Fit mapping for US size XL (38–40)

Symbol: XL (38–40)Base Value: 96.5

2XL (42–44)Size

Waist: 106.7–111.8 cm (42″–44″), Hip: 119.4 cm (47″), Style: Extended Comfort Swim Trunks, Fit: Extended Plus Fit mapping for US size 2XL (42–44)

Symbol: 2XL (42–44)Base Value: 106.7

3XL (46–48)Size

Waist: 116.8–121.9 cm (46″–48″), Hip: 127 cm (50″), Style: Big & Tall Boardshorts & Trunks, Fit: Big & Tall Fit mapping for US size 3XL (46–48)

Symbol: 3XL (46–48)Base Value: 116.8