One sheet’s size fits perfectly to children’s foreheads. Use Koolfever once, for efficacy and hygiene. After unpacking, Koolfever gradually decreases cooling effects. After unpacking, tightly fold the notch twice along the dotted line and store in a box to avoid decreasing cooling effects. Avoid storing in places of high temperature, store in a cold place preferably. Content in sheet: Gel (moisture contained in the gel absorbs and releases heat).