PG04 FR Boxer BriefsProtection where it matters most.. the PG04 FR boxer brief is made using Kermel Lenzing rib knit fabric to create unbeatable softness and comfort while being inherently FR and not melting or dripping. Our FR boxers also provide Cat 1 ARC protection to keep you safe on the job. Use as part of your PPE layers to provide additional next to skin protection and the legendary Stanfield's comfort. Sizes S XL Color: Navy Fabric: 50% Kermel 50% Lenzing FR Rib