It prevents stomach acid from escaping into the esophagus as it adjusts the sleeping position. it is specially designed for people with reflux. it has a special cover that can be washed at 30 c. poly cotton knitted fabric is used. it is fully orthopedic. it is made of sponge block. product size: 60x60x24 cmwashing instruction: no bleaching .no drying. no ironing. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.