If you're a wheelchair user or if you suffer from bad circulation it's easy to get very cold very quickly, but it's not so easy to warm up again. Slip this heated vest under your ordinary coat and you're ready for whatever mother nature has in store. It spreads a gentle warmth just where you need it most. The rechargeable batteries keep going for up to ten hours, depending on the conditions outside. If you're likely to be out all day it's a good idea to buy the extra battery kit. That way you can keep a couple of spares with you to make sure that your vest stays beautifully warm all day long.