Effective cooling time during average use
in warm conditions under 40°C/104°F
in hot conditions above 40°C/104°F
in low-mid humid conditions
in high humid conditions
underneath breathable garments
Underneath hazmat/airtight suits
without airflow
Suitable for high activity
Requirement to activate
Up to 72 hours
Low
Low
Tap Water
Up to 8 hours
Low
Low
Tap Water
Up to 4 hours
Low
Tap Water
Up to 1 hour
Low
Tap Water
6.5°C / 44°F
Up to 2 hours
Freezer
6.5°C / 44°F
Up to 2.5 hours
Freezer/ Fridge/ Ice Water or in temp <10°C / 50°F
21°C / 70°F
Up to 3 hours
Freezer/ Fridge/ Ice Water or in temp <19°C / 66°F
24°C / 75°F
Up to 3.5 hours
Freezer/ Fridge/ Ice Water or in temp <21°C / 70°F
29°C / 84°F
Up to 4.5 hours
Freezer/ Fridge/ Ice Water or in temp <26°C / 79°F