noun
cold compress
A cloth or pad cooled with water or ice and applied to the body to reduce swelling, fever, or pain.
熱があるときは、冷湿布を額に当てると気持ちがいい。
When you have a fever, it feels good to put a cold compress on your forehead.
Compound of 冷 (rei, 'cold') and 湿布 (shippu, 'compress, wet pack').