insulative

[ in-suh-ley-tiv, ins-yuh- ]
/ ˈɪn səˌleɪ tɪv, ˈɪns yə- /

adjective

serving to protect or insulate: glassware shipped in insulative packing.

Origin of insulative

First recorded in 1940–45; insulate + -ive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019