You could consider something like this for glass
Or like this for more general insulation
https://www.amazon.co.uk/General-Medi-Emergency-Blanket-Thermal/dp/B07BDF7RFZ/ref=mp_s_a_1_3?crid=25UYACTU8PGAE&keywords=foil+blankets&qid=1659957117&sprefix=foil+%2Caps%2C184&sr=8-3