The Sateen weave is a one-yarn-under and three-yarn-over weave, exposing more surface area gives sateen its signature soft as feathers feel and a luxuriously silky, luminous sheen. Enjoy the strength of cotton and the luxurious comfort of bamboo. Woven cotton and bamboo fibres make the fabric breathable, temperature regulating and strong. Ideal for sensitive skins and babies because of hypo-allergenic, antibacterial and odour resistant properties. Oeko-Tex Certified - Tested for harmful substances | Sienna Living Bamboo Cotton 400 Thread Count Fitted Sheet