Question about batting
 

I am planning on making a quilted hot water bottle cover for my prospective DIL, but am not sure which batting would be best. I love wool batting, but am worried that this might keep most of the heat in, so not actually letting much warmth through!
I would be very grateful for your recommendations, as she is not British born, and really feels the cold in our winters.

I don't know if you have them in your country, but when I lived in a very cold house, I bought a mattress pad with heat and it kept me very warm at night.
http://www.kohls.com/product/prd-202...sp?color=White

I agree about the mattress heaters!

Wool batting on a hot water bottle will simply disperse the heat more slowly. I actually think wool would be a good batting to use for a hot water bottle. Something that disperses heat faster would be useful to heat up the bed; something that disperses heat slower would be better for a person because it reduces the chance of burning and lasts longer as a source of warmth.

I love my heated mattress pad.

I made one for my rubber HWB here in the US. Even though I have an electric blanket my feet remain like ice. The inner is a pink stretch knit and outer a flowered flannel leftovers. I cannot recall what batting I used . I think it was a low loft poly batting as I was not yet in to quilting back then. It works well but I know lots of folks knit theirs.

People still use hot water bottles??? Gee, I haven't seen one in probably 30-40 years!

Thank you, but it isn't just in bed she uses it, she tends to carry it around with her and hugs it while watching tv or on her laptop.

Here in England, hot water bottles are very much still going strong. Not just for bedtime, but to ease aches and pains.

And in the US! I couldn't be without mine when I get neck and back spasms. The moist heat seems to help more than an electric heating pad but I have one of those too.

I still use the hot water bottle. Also put at bottom of bed to warm up. My mil used to heat a large stone to put in the bed and it would make the bed toasty warm. Like to have the bottle for aches when needed, prefer it over the electric pad.