US: XL (38–40) to United Kingdom Size 34–36
Cross-market men’s underwear and boxer brief conversion mapping XL (38–40) specifications into 34–36.

Analyzing Underwear Size Equivalence Across Markets
US: XL (38–40): Corresponds to a waist stretch range of 96.5–101.6 (38–40 ), hip circumference of 111.8 (44 ), thigh clearance of 63 (24.8 ), and fit style Relaxed Boxers & Extended Boxer Briefs.
United Kingdom Size 34–36: Corresponds to a waist stretch range of 86.4–91.4 (34–36 ), hip circumference of 104 (41 ), thigh clearance of 59 (23.2 ), and fit style Briefs, Boxers & Boxer Briefs.
Other Conversions to United Kingdom Size 34–36
US: XS (26–28) → uk-34-36XS (26–28) to uk-34-36
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US: S (28–30) → uk-34-36S (28–30) to uk-34-36
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US: M (31–33) → uk-34-36M (31–33) to uk-34-36
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US: L (34–36) → uk-34-36L (34–36) to uk-34-36
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US: XL (38–40) → uk-34-36XL (38–40) to uk-34-36
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US: 2XL (42–44) → uk-34-362XL (42–44) to uk-34-36
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US: 3XL (46–48) → uk-34-363XL (46–48) to uk-34-36
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