【INNOVATIVE COOLING TECHNOLOGY】Cold pillows for hot sleepers are designed with a dual-sided cover . One side is made of cooling ice silky fabric, while the other side is crafted from Viscose made from bamboo. This design ensures that the pillow remains cool to the touch, helping to reduce heat and promote a comfortable sleep environment for hot sleepers.pillows pass Standard 100 by OEKO-TEX certified that ensures product meet high safety and environmental standards.