Portwest FR53 Great Flame Resistance - Superb Weather ProtectionThe Portwest FR53 outer fabric is constructed from 99% cotton and interwoven with 1% carbon fibres. The thick wadding insulation and flame resistant cotton lining provide extra warmth. These garments are guaranteed to give you comfort and protection in cold weather conditions.Portwest FR53 Garment BenefitsBizFlame Plus - Winter options. These new winter products have been developed and designed using a highly innovative flame resistant outer fabric combined with an insulation layer and flame resistant cotton layer for added warmth and protection. Reflective tape provides the FR53 with extra visibility.