These premium ladies flame retardant trousers are of a high quality that sets them apart from average flame retardant workwear. The 320gsm Protex FR material is inherently flame retardant and anti-static which means that its special safety properties cannot be reduced by repeated washing as it is less expensive trousers that has been surface treated to render it both FR and AS. The anti-static and flame retardant symbols are clearly heat sealed to the leg giving a visible proof of their conformity.