With its liquid appearance and smooth feel, it’s easy to understand why silk is thought of as delicate. However, silk is the strongest natural fiber used for bedding, making it more durable than both cotton and linen. It’s so strong that it was the material of choice for parachutes up until World War II.

Long-strand silk is even more long-lasting: by carefully unraveling the silkworm cocoons so as not to break the individual strands, manufacturers can offer a premium fabric with fewer tear points. Synthetic fibers are slightly stronger than silk, but they will never be able to match silk’s other extraordinary qualities.

Despite its durability, silk can feel almost insubstantial and glides effortlessly on the skin. (Unlike sateen weaves and synthetic silks, real silk does not catch on feet, hands, or dry patches.) This quality makes silk part of many people’s beauty routine — its unique softness, and potentially the amino acids it contains, are kind to both hair and skin. Flyaways and frizziness are reduced and curls are protected overnight when you use a silk pillowcase, and your skin will thank you for silk’s moisture-protecting and irritation-reducing qualities.

One reason why silk is a good choice for sensitive skin is because it is naturally hypoallergenic. In fact, silk has been used for centuries in medicine as thread to suture wounds because so few people react negatively to it.

Silk resists dust, fungus, and mold. Silk is also the fabric of choice for eczema and topical dermatitis sufferers, offering both cool comfort on the skin and less potential for irritation.

Finally, silk is a natural temperature regulator. Just as the silkworm’s dislike of mold benefits us, so too does its need for a cocoon which remains at a stable temperature. As a bedding, silk is the best option for all seasons: cooling during the summer, and insulating during the winter.

Though it doesn’t have the “cozy” roughness of flannel, silk wicks away moisture and breathes easily while remaining a perfect temperature against the skin. In cold weather, simply swap your summer duvet out for a warmer option.