Large and heightening: 21cm high let you start with a few centimeters of hot water and then continue to add more and keep soaking for longer even as the water cools down.
Collapsible: Non-slip and wide handle, so you can use it is very comfortable and convenient to grip. After folded, you also can just hang it on the wall, easy drying.
Portable: After folded, it is only 7cm high, very saving space. And you can also easily carry it with when you travel or take a business trip also.