A long-acting ice pack includes a mixture of a cold preservation substance and a gel therein. The gel is mixed with a plurality of heat-insulating particles. For a portion of the ice pack, the heat-insulating particles can be used to block the transmission of the interior temperature of the ice pack and the outside temperature so as to decrease the area and efficiency of temperature transmission. The ice pack not only effectively extends the time of cold preservation, meeting the demand of ice compress or cold preservation for a long time, but also provides the most comfortable temperature for ice compress, without using a towel to cover the ice pack.

Disclosed is a therapy pack for applying thermotherapy to a user's groin for treatment of various conditions or injuries, and to aid in surgical recovery. The therapy pack has an insulated side and an uninsulated side, a two-lobed shape with a soft outer border, and contains a quantity of thermal storage material. The therapy pack also includes one or more window(s) without thermal storage material to reduce proximity of the material to genitalia. Embodiments include a three-window version and a single window version. Embodiments also include the use of one or more supplemental therapy pack(s) and a cover. Also disclosed is a method of using the therapy pack to apply thermotherapy to the male groin. Embodiments of the method include applying the therapy pack with the insulated side facing the user's skin, followed by applying the pack with the uninsulated side facing the skin.