Breathable mesh fabric and a wave-shaped urethane foam pillow. I used a pillowcase when using it. I ended up not using it very often, and it's only been used a few times. The inside is a coarse sponge-like material, and the shape is wave-shaped to fit the shape of the neck. I think it cost around 12,000 yen. 【Please Note】 ・There are no tears or odors. ・There are small dimples on the surface cover. (It seems this happened because I stored it upside down to prevent damage) ・There are no noticeable damages, but it is not zero possibility of overlooking something. ・Please refrain from purchasing if you do not understand that this is a used item or if you are sensitive to the condition. ⚠️I will block those who request a discount of 10% or more without reading the profile. Please purchase elsewhere. ・Please note that we will ship anonymously via Mercari. ・No pets, non-smoker. ・There are people who request a discount of 10% or more without reading the profile. Please purchase elsewhere. ・Please provide an evaluation within 3 days after receiving the item. ・Measured size: 50cm x 28cm x 4.5cm ※Please purchase only if you understand that this is a used item. <From the manufacturer's website> Optimized for use on your back. This pillow is designed based on the theory of structural medicine to prevent congestion and heat. - Brand: Japan Structural Medical Science Institute - Product Name: MD PILLOW - Color: Navy - Material: Mesh - Shape: Rectangular