[helipad]

Your suggested solutions don't work so well for sitting outside.

When Covid made outdoor socializing necessary, we used out hot water bottles at restaurants and at fire pits.

Blankets and gloves aren't as good at keeping nether regions warm on cold surfaces, and anything that needs to be plugged in is a no go. A minor point too but I wouldn't want batteries/electrics around fire.

Our hot water bottles kept us toasty for hours and you could also tell easily when it was running out of power, so to speak.

We've also taken them to winter cabins when you don't know how convenient electrical outlets will be. You can have several of them for when you're on the sofa, to pre-warm the bed, make the dog cozy.