Breathable mesh fabric and a wave-shaped urethane foam pillow. I used a pillowcase when using it. I ended up not using it soon after and only used it 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 about 12,000 yen. 【Please Note】 ・There are no tears or odors. ・There are no noticeable damages, but there is a possibility of oversight. ・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. ・We will ship anonymously via Mercari delivery, so please understand. ・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. Based on the theory of structural medicine, it is a pillow designed to prevent congestion and heat. - Brand: Japan Structural Medical Science Institute - Product name: MD PILLOW - Color: Navy - Material: Mesh - Shape: Rectangular