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

HSA/FSA approved

the Rincon 3 returns in a stupefyingly light silhouette

When every second counts in your long distance race

balances it with a new eco-friendly wave plate and holds your run steady with a WAVEKNIT™ upper

Maximum visibility means grabbing attention

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