Welcome to the home of the most desirable, ecological and beautifully crafted hot water bottles the world has ever seen. Flexible and lightweight, YuYu's award-winning 81cm long original invention will hug the contours of the body, like nothing you’ve experienced.  They are designed with heat-trapping bumps on their surface and stay hot for 4-6 hours.    Technical: YuYu Biodegradable rubber BOTTLE INCLUDED. Dimensions: L81xW13cm. Material: Sri Lankan grade A natural rubber bottle, 100% cotton cover. Duvet lining. Requires less than a kettle of water to fill up (less than 1 litre), cleverly designed bumps on the surface of the bottle trap air within the fabric making it stay warmer for longer.