These Microfiber Boxer Briefs are a popular style for everyday wear. Soft, breathable and extremely comfortable, these male basics are a must-have for total, seamless comfort beneath your clothes. The lycra-blend construction allows them to be secure where you need it most, even during high intensity activity. Performance Briefs. Ultra Soft Microfiber. Nylon and Lycra. XL: Waist 39-42 inches.