They provide air exchange, absorb moisture, regulate heat transfer. Especially soft and comfortable products are obtained from goose and duck down. Disadvantages: high risk of allergic reaction to dust mite excrement (they settle in the filler), the need for regular drying and disinfection. In addition, after five years, the feather collapses, the pillow loses its elasticity.
Their advantages: massage and aromatherapy effects, good air circulation. Now at the peak of popularity are buckwheat pillows, easily taking the form of the neck and head and at the same time gently massaging the skin. Such products have enough disadvantages too: increased rigidity, rustling of the cushion contents, laborious care (airing, dry cleaning, disinfection). After 2-3 years, the filler has to be changed due to wear.