A Dutch national newspaper conducted a comprehensive test and research, leading them to declare kywie as the premier passive cooler available. While other passive coolers may provide an initial surge of cold, often resulting in further cooling of the beverage and bottle, temperatures in those coolers rapidly rise afterwards. However, with kywie, the air within the woolen cooler takes on the bottle's temperature, maintaining a stable temperature for hours. It gradually warms up, losing only 1°C per hour. This holds true even when the bottle is almost empty, as the air inside the cooler remains at its temperature. The unique simple cylinder design, ensures the interior climate stays consistent around the bottle within the cooler.

Additionally, unlike any other steel wine coolers like steel, double-walled plastic that require removing the bottle each time, potentially transferring warmth from hands, kywie eliminates this need. With kywie, there's no unnecessary contact with warm hands, preserving the desired temperature of the beverage.

Traditional ice buckets, although (too) effective, are a wasteful method that consumes energy to produce kilos of ice cubes and requires significant amounts of single-use fresh water on a daily basis. kywie offers a sustainable alternative that avoids this unnecessary waste.

Choose kywie, the best and most aesthetic passive cooler on the market, and experience the perfect temperature retention for your beverages without compromising on sustainability or energy efficiency.