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 NATURAL RUBBER BOTTLE INCLUDED. * Dimensions: L81xW13cm. * Material: Sri Lankan rubber bottle, 100% cotton waffle 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.