Shin Bio Heat Packs
- Safe; contains only water, sodium acetate and its aluminium disc.
- Depending on size; heats for at least 30 minutes and up to two hours.
- Has a variety of sizes and is very portable.
- Provides heat, simply click the metal disc.
- Provides cold, simply place in the refrigerator for 1 hour.
- Reuse multiple times by simply boiling.
- Has a 1 year warranty.