Does your underwear have a fly? Most of our underwear styles have a standard fly, as noted below. With a fly: 18-Hour Jersey (all styles) Silver (all styles) 24/7 Woven Boxers 18-Hour Knit Boxers AIRKNIT Performance Tight WARMKNIT Long Underwear Without a fly: AIRKNITx (all styles) Stealth Tech Cashmere Long Underwear Related articles Why are the labels on the outside of the underwear? Where is Mack Weldon made? How does the underwear fit? Can I suggest a new product? What is your Try On Guarantee?