✅ 1. Inside: Thanks to the advanced snowflake aluminum film and double-layer lamination technology, the cooler bag has better thermal insulation and cold insulation effects. ✅ 2. Middle layer: The thickened insulating sponge not only prolongs the heat and cold preservation time, but also shapes the good stability of the lunch cooler bag. ✅ 3. Outer layer: upgraded version of the material in High-density cationic oxford fabric, elegant appearance, comfortable hand feeling, wear-resistant and durable. ✅ Fashion design: The fashion and simple style fits perfectly in modern offices, schools, etc., both appearance and practical needs have been met. ✅ Appropriate Size: 6.5L portable capacity design, not too big or too small, ideal for meeting the needs of most offices, schools , camping picnics, etc.