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) Woven Boxers Merino Long Underwear 18-Hour Knit Boxers WARMKNIT Long Underwear Tech Cashmere Long Underwear Without a fly: AIRKNITx (all styles) PROKNIT Boxer Briefs 8" Related articles Can I suggest a new product? How does the underwear fit? Why are the labels on the outside of the underwear? Where is Mack Weldon made? What's your return policy?