The ColPaC Cold Pack is a reusable cold pack making it excellent for use in cold therapy. Each pack is filled with non-toxic silica gel that remains pliable throughout treatment and can be used for up to 30 minutes at a time to reduce acute pain, swelling, bruises, sprains, muscle soreness, strains, and fever; to recharge the ColpaC, simply place it in a chilling unit or a freezer. Designed for heavy clinical use Effective pain relief Filled with a non-toxic silica gel that remains pliable throughout treatment Delivers up to 30 minutes of soothing relief from acute pain, swelling and fever Latex-free One-year Warranty Filled with a bentonite and glycol blend to keep from freezing solid