noise cancelling headphones
These are great. Not only to offer quiet time for students, but personally, I love them for travel on an airplane or when working from home. I didn't realize just how amazing they worked until I tried them myself. So helpful to shut out the sounds around you and focus.
These are comfortable to sit on, offer sensory support and allows some movement or fidgeting. It can be used on a chair, stool or floor and usually has a bumpy and smooth side to choose from.