It is thermal-insulation and heat retaining, giving you a comfortable hand feeling. Fill and use with water injection design.It is made from PVC, flannelette. Retains heat for an extra long time. This lovable hot water bottle & cover will keep you warm for a whole night.Hot water bottle can be used alone as a remedy for aches, Machine washable.It is thermal-insulation and heat retaining, giving you a comfortable hand feeling. Fill and use with water injection design.Package Included:1 * Water BagNotes:1. Measurement of the item lying on the table may cause slight difference.2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness when photo taking.Thank you for your understanding!