This is a cushion cover, pillow cover, towel, or cloth.
From "That Time I Got Reincarnated as a Slime" comes a reversible cushion featuring Rimuru in his Slime and human form! Simply unzip it to pull out which form you prefer, and let the beads inside fill up the opposite version and you're ready to relax with Rimuru!
[Slime Cushion Size]: About 20cm tall x 28cm wide x 20cm deep
[Human Cushion Size]: About 38cm tall x 26cm wide x 18cm deep