The fibres used in this fabric include 60% Modacrylic, an inherently flame retardant fibre that does not combust, the fibres are difficult to ignite and will self-extinguish, providing natural flame retardancy without the need for an FR chemical treatment in the textile process. These fibres are blended with 39% cotton and 1% carbon fibre for added strength and protection against electrostatic discharge hazards. Technical data: Inherent flame resistant qualities will not diminish with washing. Protection against radiant, convective and contact heat. Back pocket. Rule pocket. Quick and easy side access. Action back for extra freedom of movement. Triple-stitched seams for extra durability. Concealed brass zips on chest pockets. Hook and loop cuffs for a secure fit. Two tier knee pad pockets allowing two positioning options. Sew on flame resistant industrial wash tape.