3. The inner layer of the product is pearl cotton covered with aluminum foil reflective insulation layer, which provides good thermal insulation effect. 1. Insulation bags, ice packs, ice packs, also known as passive refrigerators, is a kind of package with high thermal insulation and constant temperature effect (having the effect of warming in winter and cooling in summer). 2. Suitable for driving, driving, holiday outings, family picnics. 4. From then on, you can carry cold drinks and cold drinks on the car and outdoors No more having to endure warm drinks!