This is a gel cushion from TITIROBA. I purchased it, but it didn't fit the chair I'm using, so I only used it a few times and it's been stored at home. The cover is removable, so it has been cleaned at home, and the gel mat has been wiped and dried in the shade. It's an extra-thick type with a thickness of 4.5cm. 50 x 50 x 4.5cm Thank you for looking.