Vertxdead Letter Sling Pack long sleeve The FlexTech Base Layer fabric The FlexTech Base Layer fabric features an intimate blend of cotton and spandex for quick drying comfort with Nano Moisture Wicking and antimicrobial technologies to inhibit the growth of odor causing bacteria The steel safety toe meets ASTM F2412 18 and F2413 18 standards for impact and compression This mid sized sling works and plays large because of the versatility built into every critical feature Multiple carry options let you move confidently and discreetly on the street with invisible CCW and ballistic panel capabilities as well as a full complement of office friendly aesthetics and organization