Thank you for viewing! Instant purchase is welcome, and I will carefully package your order. Thank you for your consideration. [Two-Layer Construction for Ideal Sleep Comfort] This two-layer design combines softness and support. It conforms to your body shape and distributes pressure, reducing strain on your neck and shoulders, leading to a high-quality sleep experience. [Comfortable Sleep All Year Round] The pillowcase uses PCM phase change material, a cutting-edge space technology. It absorbs and releases heat according to your body temperature, supporting comfortable sleep regardless of the season. [Selectable Pillowcase Comfort] The pillowcase is double-sided. One side is made of 100% cotton, which is gentle and soft on the skin, and the other side is a smooth blue material that provides a pleasant touch. You can enjoy your preferred feel depending on your mood or the season. [Suitable for Any Sleeping Position] The large pillow is ideal not only for back sleepers but also for side and stomach sleepers. It gently supports your neck and shoulders, promoting a natural curve.