The Hydrocollator Moist Heat HotPac has been the first choice of professionals for over 60 years. The HotPac offers moist heat therapy for pain relief from spasms, muscle strain, back pain, myofibrosis, and arthritis. Each HotPac is resusable for hundreds of treatments, and each use provides up to 30 minutes of consistent heat. They are made from a combination of bentonite, which is a natural hydrocolloid filling, wrapped in a cotton band. Each HotPac is also labeled for easy distinction in busy clinics. Preferable over dry heat therapies, moist HotPacs are most often used in rehabilitation, chiropractic treatments, athletic training, and physical therapies