The HypaGel Hot/Cold Pack is ideal for the ongoing treatment of inflammation, sprain and strain injuries, acute sports injuries or chronic muscle pain. The HypaGel Hot/Cold Pack can be cooled in a refrigerator or freezer for use in cryotherapy, or heated in a microwave for use in thermotherapy. The HypaGel Hot/Cold Pack is available in the following sizes:- Compact (13cm x 14cm)- Standard (27cm x 16.5cm)- Large (30 x 20cm)