Heat resistance: Main unit: 284°F (140°C), Tongs: 322°F (150°C); Cold resistance: Main unit, Tongs: -40°F (-40°C). Please read
Reusable, eco-friendly chiro that can be used repeatedly by heating; Microwave for 5 minutes and boiling water for 10 minutes! Heats up with either one! Soft Feeling! Stay warm. Heat resistance: Main unit: 284°F (140°C), Tongs: 322°F (150°C); Cold resistance: Main unit, Tongs: -40°F (-40°C).