Constructed with comfortable cotton, Chill-Its® Standard 6230 and Flame Resistant 6215 and 6215HV have hook-and-loop closure on shoulders and waist for customizable fit. Once packs are activated, cooling is immediate and maintains constant 58°F for up to 4 hr. Available in khaki and hi-vis orange, respectively, Chill-Its® 6215 and 6215HV are constructed with Modacrylic cotton-blend FR fabric boasting ATPV rating of 7.1 cal/cm². Honeycomb cooling packs are non-toxic and non-carcinogenic.