Temperature-mediated construction of a plantar pressure-relieving, thermally insulating, and biodegradable thick-walled cellulose sponge insole

•First study using a temperature-mediated interfacial assembly to construct thick-walled cellulose sponge (TWCS) from biomass.•Confirming the temperature-mediated interfacial assembly by Raman imaging.•TWCS insole with excellent structural stability, plantar pressure-relieving, and thermal insulating properties.•TWCS insole can complete degradation within 50 days under biological conditions.