The Hydrocollator moist heat pack provides up to 30 minutes of deep soothing, moist heat. Brown tabs are on most packs for easy rotation in busy clinics. The packs are cost effective and provide hundreds of treatments from one pack. Packs to be used with hot pack cover or heavy toweling wrapped around pack. Hydrocollator Moist Heat HotPacs are the first choice for physiotherapists, physicians, chiropractors, athletic trainers and kinesiologists for over 60 years. Chattanooga is the inventor of the original Hydrocollator HotPac and proud to still be producing this all-natural product today. The benefits of moist heat therapy over dry heat are well established for pain relief due to arthritis, myofibrosis, back pain, muscle strains and spasms.