Wool and polyester is a winning pillow combination. Wool lets your skin breathe by drawing moisture away from your body to maintain comfort, and keeps your head cool on hot nights and warm on chillier ones. Wool also gives the pillow some density for firm support of your head and neck, letting your muscles relax. Polyester fibres are light and fluffy, providing bounce and loft for superb comfort. This pillow contains Australian wool, with a Purafresh-treated cotton to discourage mould and mildew. Recommended for back or side sleepers.