S (fits waists 28-30); M (fits waists 32-34); L (fits waists 34-36); XL (fits waists 36-40); XXL (fits waist 42-46).
The guys at Mack Weldon know that underwear doesn't have to be underwhelming, so they make their briefs from a stretch cotton-blend jersey that rests for 18 hours before it's cut, giving it extra softness and a more consistent fit. These ones also have mesh zones to keep you cool, a no-roll waistband and a leg design that prevents them from riding up.
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