Why? Because they're designed to do that. They will either cause some serious groin chafe (because the material isn't soft enough) or cause serious squishing (because the underwear construction squeezes your nutsack against your thighs.) That's why we created the BÆRSkin Breeze Boxers with ultra-soft Modal material, minimal seams and a separated 3D pouch. 

• Secure 3D Pouch that holds and isolates the family jewels in the first-class lounge. 
• 2x Softer for wearing all day long, thanks to the Modal material. 
• No Chafe, No Irritation due to the tagless waistband and seamless construction.