Defcon 5 Thermal Multi Collar White NSN 8415150236309 WH. It provides warmth and breathability. The inside mesh traps air creating a pleasant heating effect and it expels sweat without letting water in. Specifications for Defcon 5 Thermal Multi Collar: Manufacturer: Defcon 5 Gender: Unisex Age Group: Adults Hat Size US: One Size Hat Style: Collar Fabric/Material: Cotton/Spandex Application: Tactical Weight: 0.07 kg Activity/Occasion: Tactical Features of Defcon 5 Thermal Multi Collar 100percent polyester Weight: 0.08 Kg Comfort DRY Package Contents: Defcon 5 Thermal Multi Collar Defcon 5 D5-1939/2 WH: Thermal Multi Collar White NSN 8415150236309