Just open the inlet on the back of the product and put in ice and water! A touch neck cooler. It can be used by everyone from children to adults. It can be used in many occasions such as sports, outdoor, eye protection during outdoor work, and indoor heatstroke prevention! The U-shaped shape can be used on shoulders, knees, thighs, etc. in addition to the neck. It can also be used to prevent cold in winter by putting in hot water (below 60℃). Specification:E: U pillow light blue+gray super soft Color:As Shown Material:PVC Product size about:21x18x6cm/8.2x7x2.3inch Package Contents: 1 * Neck Cold Ice Pack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.