Kevin.Murphy Heated.Defence, Heat Protecting Volumising Spray. Hydrolyzed Silk - High molecular weight protein that adds shine and hair surface protection. A conditioning ingredient that provides ease of combining and smoothness to feel of hair. Provides control to the hair from application to completion of styling. The Kevin Murphy X-HP complex provides unrivaled defence against the intense heat generated by modern appliances while delivering impressive style hold. This product offers X-treme Heat Protection, Protecting Hair at temperatures up to 428F.