•Supplied with 2 litre BS 1970:2012 natural rubber hot water bottle
•One adjustable size fits most adults between Small and X-Large sizes, can be worn either on front or back
•An easy on & off sling design with a soft and comfortable water and wind resistant outer softshell cover, can be worn either over or under jackets
•Interior insulation reflects heat back to source resulting in longer warmth duration as well as gentle release of warmth