Provides up to 30 minutes of cold therapy 
Clay inside / urethane outside 
Institutional grade packs are made of durable heavy-duty urethane exterior which can  be chilled to a lower temperature than other packs  and a bentonite clay interior 
Chilled pack should be wrapped in towel before applying to treatment area 
Notice to California Consumers: WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm