18 hours long-term heat preservation,vacuum insulated double wall vacuum insulation technology eliminates the transfer oftemperature to the outside. your food will stay hot and cold as long as science allows2;crafted from premium food grade 304 stainless steel with super thick structure. it will never rust or leave a bad metal taste in your mouth, highly resistant to rust3;leakproof and easy to clean,extra wide mouth. seamless welding food jar can hold any food, pasta or soup without leakage. the size of it fits for children's lunch and adults' meals