Yes I don't think they are very useful on cold days. I'm not sure if Gripgrab makes thicker ones too... I actually expected these to be made of 'raincoat material' and didn't really look into it when I ordered them...
Ah got you. Might not bother then, I've got some decent neoprene ones that do the job when it's cold and wet and waterproof socks and mudguards for when it's less cold but still wet.
Maybe a good bet for when it's wet but not super cold then? Or are they a bit boil in the bag?