2UNDR Swing Shift Boxer Brief Size:XXLarge HSA/FSA approved

HSA/FSA approved

the Rincon 3 returns in a stupefyingly light silhouette

Iconic style complemented with the signature comfort of the BIRKENSTOCK footbed

electrolytes and hydration to fuel your adventures

2UNDR Swing Shift Boxer Brief Size:XXLarge HSA/FSA approvedThe Swing Shift caresses the skin with the finest beechwood fibre in our signature modal fabric. Additionally, the material resists shrinkage and is less likely to fade or pill. Perfection in your pants. The Swing Shift caresses the skin with the finest beechwood fibre in our signature Modal fabric. Pure heavenly softness. Perfection in your pants. Patented Joey Pouch for support and comfort No Drip Tip with hydrophobic membrane for a dry environment