Abstract: This article insulates the toes and feet of a cross-country (Nordic) skier when it is secured in position atop the forward part of the ski boot by strap means and by the clamping effect of the bail of the ski binding on the tongue section of the article. The article consists of two fabric components, an upper and a lower, attached at their front and lateral edges. They are shaped and dimensioned to fit over the forward part of the boot upper and to contain a pad of insulation between them. The tongue section is an extension of the two components beyond the toe end of the boot upper; it contains no insulation. A first strap, attached to the insulator, extends over the insulator and beneath the boot sole to hold the insulator in position against the boot upper. A second strap extends around the heel of the skier's boot and also serves to hold the insulator in position.