This is our large knitted cover which includes a natural rubber hot water bottle. The soft terry structure diffuses and keeps the temperature of water longer. The stretchy rib neck allows for easy water bottle removal. Cover is machine washable at 40°C/100°F. * Volume: 2 liters * Dimensions: 22 × 38 cm * Cover: 100% organic cotton * Bottle: 100% natural rubber * 470 GSM (grams per square meter) * Cover: Made in Berlin, Germany * Hot Water Bottle: Made in Germany