Silky sleep mask from Jo Browne to block out the light for total relaxation and restful healthy sleep. Made with 100% organic bamboo with 400 Thread. Cooling effect – breathable weave cools and adjusts for a comfortable sleep Bamboo silk is a vegan and cruelty-free alternative to traditional silk. Hypoallergenic, free from harmful chemicals and ideal for sensitive skin Jo Browne eye mask is made with 100% bamboo with 400 thread count to soothe tired eyes, aid sleep and encourage deep relaxation. This weave of this material has a cooling effect on the skin to create a comfortable sleep environment. The mask blocks out the light for total relaxation and a restful healthy sleep. Bamboo silk is vegan, hypoallergenic, free from harmful chemicals and ideal for sensitive skin.