I am selling this item because I accidentally purchased it thinking it was a cooling type sheet. Therefore, it is new and unopened. I purchased it this summer. Quoted from the following site: ● Size: Approximately 59cm (length) x 34cm (width) ● Material Body: 100% Polyester Filling: 100% Polyester Core: Urethane foam ● Washing: Hand washable ● A soft and moderately thick seat cushion for strollers. ● Made of mesh fabric, it is breathable and prevents heat from accumulating on the back. ● Compatible with 5-point strollers ◎ It has grooves for easy belt passage, allowing for secure fixation. Due to its thickness, it will be slightly compressed for shipping.