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 Without a fly: AIRKNITx (all styles) 18-Hour Mesh Related articles Why are the labels on the outside of the underwear? What size should I buy? Where is Mack Weldon made? What is your Try On Guarantee? What is 18-Hour Jersey?