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Sizing for men's pants is generally easy. What's the size of your waist and how long are your legs? Underwear? Not so much. We're stuck in the rut with ill-defined sizes like "extra small" and "large". Enough of that. Here are the top underwear brands, and what measurements those S, M, and L tags actually line up to.

Waist (inches) 26 28 30 32 34 36 38 40
2(X)IST S S/M M M/L L L/XL XL
2EROS XS S M L XL XXL
2UNDR XS S S M M L L XL
Addicted XS S M L XL 2XL 3XL
Agacio S S M M/L L XL XL
American Eagle XS XS/S S S/M M L L XL
Andrew Christian XS XS/S S/M M/L L/XL XL
AussieBum 2XS XS S M L XL 2XL 3XL
Big Boys S S M M L L XL
BN3TH 2XS XS S M L L/XL XL XL
C-IN2 XS S S/M M M/L L XL 2XL
Calvin Klein S S M M L L XL
CandyMan S S/M M/L L/XL XL
Champion XS S S M M L L XL
Clever S S/M M/L L/XL XL
Cocksox S S M M L L XL
Comfyballs S S/M M M/L L XL 2XL
Daniel Alexander S M M L XL XL
David Archy S S M M L L XL
Diesel XS XS S M L L/XL XL/2XL 2XL
Doreanse S S M L XL 2XL
Duluth Trading Co S S M M L L XL
Emporio Armani S S M M/L L/XL XL
Ergowear XS XS/S S/M M/L L/XL XL
Fruit of the Loom S S M M L L XL
Go Softwear S S M L L XL
Gregg Homme XS S M M/L L/XL XL
Hanes XS S S M M L L XL
Hung S S M M/L L L/XL XL
Intymen S M M L XL XL
Jockey S S M M L L XL
Jack Adams S S M M/L L XL XL
Jockmail M M/L L/XL XL/2XL 2XL
Joe Snyder S S M L L/XL XL
JOR S S/M M/L L/XL XL
Lapasa 2XS XS XS/S S M M/L L XL
Lululemon XS S M M/L L XL XL
Male Power S S M M L L XL
MaleBasics S S M L L XL
Mack Weldon S S/M M M/L L/XL XL XL
MeUndies S S/M M M/L L XL XL/2XL 2XL
Michael Kors S S M M L L XL
MOB S S M M L L XL XL
Mundo Unico S S/M M/L L/XL XL
N2N XS S S/M M L L/XL XL
Nike XS XS S S M M
Obviously S S M M L L
Papi S S M M L L XL
Pair of Thieves S S/M M L L XL XL
Pikante S S/M M/L L/XL XL
Polo Ralph Lauren S S M M L L XL
PSD S S M M L L XL
Pump S S/M M/L L/XL XL
Reebok XS XS S S/M M/L L L/XL XL
Saxx XS S S/M M L L/XL XL
Separatec S S M M L L XL
Sheath S S M M L L XL
Shinesty S M L L XL XL
Sukrew S S/M M M/L L XL
T-Bô S S/M M L XL XL
Tommy Hilfiger S S M M L L XL
UFM XS S S M M L L XL
Underarmour XS S M M L L XL XL
Unico S M L XL
Uniqlo S S S/M M M/L L/XL XL 2XL
WildmanT S S/M M L L/XL XL XL
Xtremen S S/M M/L L/XL XL