TITAN Emergency Mylar Survival Blankets -- Check this awesome product by going to the link at the image.
Make Your Own Energy Saving Thermal Curtains Project » The Homestead Survival
Wicked cool. We can't afford a new thermal blanket. But this is an awesome alternative.
10 Survival Uses for Mylar Emergency Blankets via @prepforshtf
How to make a thermal blanket for ends of pop up camper
Johns Cross Motorcaravan and Camping Centre - Fiamma Thermo Wall Ducato, £60.00 (http://www.johnscross.co.uk/products/fiamma-thermo-wall-ducato.html)
This waffled thermal blanket—$89 | 19 Insanely Cozy Accessories That Will Make You Never Want To Leave Your Bed
ABC Thermal Blanket - Blue
'Retro Circles' crochet cot blanket This would be awesome made with cotton yarn so that it's sort of like a thermal blanket.
LCM Home Fashions All Season Cotton Thermal Blanket Ivory - B052B