When sourcing safety vest fabric, the primary focus must be on fluorescence and reflectivity. The fabric is typically made of 100% Polyester (warp-knitted or mesh) to ensure breathability and durability. Key technical metrics include a weight range of 120gsm to 160gsm for standard vests. For specialized environments, you must specify requirements for Flame Retardant (FR) properties, Anti-Static fibers, and Water Repellency (DWR coating). Ensure the fabric maintains its chromaticity coordinates and luminance factor even after multiple industrial wash cycles.