Dingley J, Stephenson J, Allender V, Dawson S, Williams D. Anaesthesia. 2018 Jul;73(7):856-862
To investigate the hypothesis that i-gel cuff softening occurs during warming to body temperature, this study used a probe to measure cuff hardness and resilience on devices mounted in a monitored water bath to provide 105,864 data points at 11 temperatures. Authors conclude that hardness and resilience reduced with warming, but at levels that may not be encountered during clinical use.
Link to abstract.