There's something I don't understand regarding hot water bottles.

I've never used one, someone made a post here about them, and I was thinking about it. Over time, doesn't the water in the hot water bottle become cold? So how is that supposed to keep you warm, if the water gets cold?

Why not just throw on extra layers to keep warm instead?

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Gusman · 61-69, M

It was placed in the bed to warm the sheets so as not to get into an icy cold bed.
It stays hot long enough for you to feel comfortable, allowing sleep.
Instead of shivering with the cold.

Fluffybull · F

@Gusman Exactly. It takes a while for the water to get cold and the bottle can be hugged to warm you up.