These 100% Silk Pillowcases are great for the perfects nights sleep. Silk is a natural breathable fabric, and no chemicals were used in the manufacturing of these pillowcases. Size 45x75cm . The Chinese and Japanese have recognised for well over a millennium that silk eases aches and pains like arthritis and rheumatism. They have also noted that silk soothes itchy skins and prevents vascular sclerosis. A possible contributing reason for these benign traits is that silk, being formed of several amino acids, is very like human skin. Silk, being hypoallergenic, is great for allergy sufferers, such as asthma and eczema. No chemicals are used in the production of the silk floss, so there is no concern that, unlike some other duvets no residual chemicals remain.