Beer sleeve, cup holder or resting base?
Separate temperature, attachment and stability needs.
Insulation
An insulating sleeve addresses a different need from a wider base. Steadi has no claimed insulation rating, and a sleeve can change fit.
Mounted holders
A mounted holder attaches to a specific support. Follow its maker’s requirements; Steadi does not attach to the table.
The resting footprint
Steadi is a freestanding base for a compatible container. An open can remains open and can still spill.