HOT WEATHER UNIFORM: the Propper Tactical Mesh NYCO ballcap is made of the same 5.5-5.8 oz. 57% nylon / 43% cotton ripstop in OCP camouflage pattern that that US Army uses in their IHWCU Hot Weather ACU Uniforms. The mesh panels are 100% Polyester in Tan499 color. BENEFITS OF NYCO: This modern 57% Nylon, 43% Cotton ripstop fabric is that it is more breathable and faster drying than military NYCO fabrics of the past. Keep your head cool and comfortable in the hottest conditions. TAN 499 TRIMS: The inner lining and sweatband, the polyester mesh panels, the hook and loop patches, and interior stiffener are all Tan499 authentic military color and quality. IDENTIFY YOURSELF: Tan499 loop field located on the back of the hat above the adjustment strap is approximately 5" wide for nametape placement. ONE SIZE FITS ALL: Hook and loop adjustable back is adjustable for the perfect fit across all adult hat sizes.