For cold use: Place pack in the freezer for up to 2 hours before use. Wrap in a cloth or protective sleeve before applying directly to the skin. Use pack in short intervals no longer than 20 mins.
For hot use: Place pack in the microwave for 20 seconds at 600W. Increase heating time in 10 second intervals to reach desired temperature if needed. Times should be reduced for microwaves with higher power ratings. Wrap in a cloth or protective sleeve before applying directly to the skin. Use pack in short intervals no longer than 20 mins.