You do need to keep them plugged in in order for them to work.
It's worth considering which ones would be better for you to use by comparing how often you'll use them.If your feet get chilly easily then you may want to consider buying heated insoles which Martin said start at £8.
As a southerner I’ve had great advice from Northern people who use gadgets such as Jumpers, coats and blankets to keep warm. Has anyone else found these to be effective?
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