Nemo’s $100 Puffin blanket is designed for outdoor use, and it might be perfect for cool nights at anchor. It’s filled with Stratofiber insulation that stays warm when damp and ripstop nylon shell. The blanket is tricked out with buttons that lets you fold the end of the blanket over your toes. The 86- by 60-inch purple or black with light blue Puffin folds into a zippered, breathable bag. It weighs just over 2 pounds, and packs down to 15 inches by 7 inches. Read more about it at Nemo's website.