100% Mulberry silk. It stays on all night and light as a feather.</br>Silk has lowest frictional irritation to human's skin among all kinds of fibers.</br>With teeming hydrophilic groups and multi-porosity the protein fiber of silk can help intake and keep moisture.</br>Silk on the body plays a certain massage role that can prevent wrinkle when rubbing against the skin. It strengthens the activity of epidermal cells and reduces the possibility of microbes' breeding.</br>BREATHABLE silk are widely acknowledged as 'human's secondary skin' and lauded as 'Queen of fibers'.</br></br>Product Description</br></br><b> Skin-friendly lining and filler</b> <br> The lining is made of pure silk which is skin-friendly to the delicate skin with essential amino-acids. It's light as a feather and perfect for breathability. The filler is the queen of all fibers mulberry silk. These fibers arise from the natural cocoon made by the bombyx mori which is raised under extremely controlled circumstances. <br> <br> <b>Improving the quality of sleep</b> <br> Known as a beauty treatment for centuries in Eastern Cultures silk is a natural way of keeping wrinkles at bay. As you sleep MSSilk silk eye mask helps reduce moisture loss and wrinkles around the eyes. <br> MSSilk also improves the blood circulation around the eyes?? reducing blood congestion in the eyeballs?? and thus preventing dark circles. <br> Silk not only excels at heat radiating?? due to its multi-porous fiber structure?? it's also good at heat preservation. It can