Warm hot water bottle cover. Made of wool fabric. The back uses leftover coat fabric, so it's warm. It's always cozy. We use it for our cat. Width: 25 cm Length: 37 cm Fits hot water bottles up to 49 cm in circumference. Bottles larger than that will not fit. Please measure the circumference of your hot water bottle before purchasing. This is handmade by an amateur, so please understand. Thank you for your purchase.