Custom-designed cooling pads (see picture below) are chilled in the freezer or heated in hot water. The heated or cooled pads are placed inside the cap. The cap is made of cotton and can be purchased in several colors and sizes. Also available as a sun hat.
Pernilla Hampf, Isar collection
Isar Collection, isarsweden.se/english (last checked June 2020)
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This tip is from 2005