T400 HI-VI: The Performance Standard for Safety Workwear Eliminate the trade-off between safety compliance and worker comfort. Our HI-VI Fabric with T400 technology is an industrial-grade solution that pairs mandatory high-visibility with permanent, spandex-free stretch. This material delivers superior shape retention and maximum flexibility for demanding jobs, while resisting the wear, tear, and fade of industrial washing. Upgrade your uniform line with fabric that works as hard as your crew does. Polyester 85% cotton 15% Hi Vi yellow, Hi Vi orange: 270gsm Cotton 50% recycle polyester 50% Hi Vi yellow, Hi Vi orange: 280gsm