NOTICE: Because of the natural rubber material, there may be some odor, please understand. We recommend not to touch skin directly after hot water is injected to avoid scalding, use it safely with suitable temperature. Easy To Use- Allow boiling water to cool slightly before pouring( DO NOT USE BOILING WATER). Grab the neck of hot water bottle. Fill in water slowly up to 2/3 full. Press the residual air out slowly and tighten on the screw cap. Make sure there are no leaks before using. Package included: 2 Rubber Hot Water Bottle, 2 Soft Knit Cover. Our hot water bottle is manufactured to B.S.1970:2012 to ensure maximum safety. Cute Protective Cover- Shipped with soft removable knit covers to help insulate the hot water and maintain effectiveness for 6-8 hours. It also protects the hot water bottle from crash and dirty and keeps your hot water bottle using longer. The cute and attractive pattern on the cover makes the hot water bottle a thoughtful and cozy gift for your mother, father, children, friends, lovers in Mother's Day, Thanksgiving Day, Christmas and New Year's Day. Multifunctional Hot Water Bottles- Hot water bag can be used alone as a remedy for aches, pains and sports injuries, such as back, neck & shoulder pain, muscle sore, menstrual cramps and tension( calm period pain). Besides the traditional hot therapy, it can also double up as a cold compress for kids with fever or to reduce swelling for minor injuries.( Do not use the microwave for heating). Keep You Warm for Long- Aikotoo rubber hot water bottle with cover is made from 100% natural rubber, which helps maintain liquid temperature and hold the heat longer than traditional silicone hot water bottles. Fill the bottle with hot water, place it in the bed up to 10 minutes before going to bed, our thermal hot water bottles will prepare a warm and wonderful sleep atmosphere for you.