Advanced PVA cooling technology; super-evaporative, feels significantly cooler than ambient air. Activates fast and easy: run under water for one minute and simply re-wet to reactivate. Only 1/3 the size of the Chill-Its® 6602 with the same cooling power. Use as a neck wrap by pulling end of wrap through slit. Wear for hours or for quick relief. Machine washable. Measures: 4" x 29 1/2". Blue.