● A new type of hot water bottle made of a soft material that can be used without a cover and is less likely to cause low-temperature burns. ● Insulation ● Uses wetsuit material with high heat retention. ● Recommended for those with stiff shoulders. This is a CLOZ hot water bottle. I purchased it used, but I have never used it. There are stains in various places. There are no instructions. Thank you for your understanding. I am also selling one for feet. Please take a look if you'd like.