Custom-designed cooling pads (see picture no. 2) 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 (photos no. 2 and 3).
Pernilla Hampf, Isar collection
Isar Collection, www.isarsweden.se (last checked May 2017)
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This tip is from 2005