Wine Cooler Sleeve Material: The surface of the wine cooler is made of waterproof polyester, no fading, soft but not deformed. Filled with premium gel, non-toxic and harmless, anti-corrosion, anti-mildew and environmentally friendly. The premium material ensures good cooling or warming effect. Active Cooling: This wine cooler sleeve actively cools wine and keeps it cold for hours. The wine cooler sleeve cools wine more efficiently if you put it in the refrigerator for refrigeration (not freezer and icing) for 1 hour before using, then wrap the wine bottle with the sleeve and keep it for 15 to 20 minutes. Long freezing time will make the sleeve too stiff to wrap around the bottle. Flexible and Space-Saving: This wine cooler sleeve is flexible and virtually unbreakable, and lays flat when in the freezer, taking up minimal space. Lightweight and Portable: The wine cooler sleeve is lightweight and easy to carry for parties, picnics, barbecues, vacations, etc.Wine gifts for many uses: Our thermal sleeve is not only suitable for wine bottles, but also for beer bottles, champagne bottles, etc. An ideal gift for your family and friends.