Something I wrote 3 years ago
Don’t go 12v. You need 5v and a usb power bank. I’ve just sold my 12v heated jacket after 25 years. Great on the motorbike but the battery pack, way to big for walking.
£30 from Amazon for the jacket. Look at the measurements in cms, not s,m,l,el etc. £15 to £20 will buy you a power bank as well.
wicking T-shirt, heated jacket, then fleece or puffer style jacket with waterproof jacket on top. Also get a heated jacket without sleeves but ensure it has a heated neck. Makes for a world of difference.
speaking as a person who can freeze in 30 degrees I know what I talking about. And as for the b#####ks about merino etc. Been there done that. If it’s cold, it’s cold, extra heat warms you up and the fancy layers keep the heat inside. That is the only thing that works. Unless you are one of those who has a bbq in the depths of winter wearing a mankind cos your hard as fxxx. In which case, I hate you. Cos I’m kin freezing in my 25 layers.