On Sale Choose Options Compare Quick view Thin Blue Line Flag Hat Low Profile Cap ChiefMart MSRP: $18.00 Now: $10.00 Was: $12.00 Thin Blue Line Flag Low Profile Cap The Thin Blue Line is a symbol of respect and support for Police and Law Enforcement Officials. MSRP: $18.00 Now: $10.00 Was: $12.00 Choose Options Compare Quick view