Never felt the need for them but I run hot (except my feet)
Keeping my feet warm is more of a challenge, antiperspirant, thin merino socks, winter hiking socks, disposable foot warmers, shimano mw5s & neoprene over shoes bo the job for me.
Keeping warm is relatively easy if it’s dry & cold. It’s more of a challenge if it’s wet and cold.
Try and find some ice spikers!