a poly vinyl chloride coated woven polyester in the more preferred embodiment the material weight is approximately 22 ounces per square yard in the preferred embodiment outer layer 50 has physical properties near to or superior to those provided in table 2 below in another preferred embodiment it is seen that there is an economic advantage to utilizing an external layer 50 which fabric weight exceeds the fabric weight of internal layer 46 in another preferred embodiment of the present invention advertising or promotional indicia are printed directly onto outer layer 50 silk screen is an effective method of printing images on outer layer 50 insulation layer 48 is located between inner layer 46 and outer layer 50 in the preferred embodiment insulation layer 48 is a low density closed cell polyethylene foam in another preferred embodiment insulation layer 48 has a density of approximately 2 0 lbs ft 3 in the preferred embodiment insulation layer 48 has physical properties near to or superior to those provided in table 3 below referring to fig1 of the drawings the reference numeral 10 generally designates a concrete truck concrete truck 10 has a drum 12 which is covered with an insulator 14 as can best be seen in fig2 and 3 insulator 14 is a uniform insulating blanket having a front section 16 an intermediate section 18 and a plurality of body sections 20 22 24 and 26 in the embodiment illustrated each body section 20 24 and 26 forms a frustum particularly a conical frustum body section 22 forms a cylinder a seam 28 traverses the length of insulator 14 terminating at opening 30.