The invention relates to a ski boot with an element in shell form, which at least partially consists of a plastics compound material, wherein the compound material comprises a mixture of caprolactam polyamide and ionomers, and to a method for the production thereof, such that cations and anions of the ionomers form ion bonds, wherein elastic components of the compound material form a physical network that is soluble between 60° C. and 100° C., and so the element in shell form of the ski boot that at least partially consists of the compound material can undergo thermoforming below 100° C.