LOL! I concede they look as though they'd be warm, but I have always found these off-putting. One of the great things I love about socks is that I can partially conceal my canoe feet, but toe socks do not offer that same 'coverage'.
I have seen these often over the years,but they are about the most restrictive thing I have ever worn;even just as Bed Socks!!!! Being in Nth Qld for the past 35 years (next month!) I have had no need for anything even close to bed socks for most of my adult life,but when I lived in,and revisited Melbourne,these were all the rage!! There are some utterly adorable designs of these toe socks out there,but what a huge pity they are,for me, totally useless!!