Reddit reviews Snugpak Jungle Blanket

https://smile.amazon.com/Premium-Outdoor-Hammock-Carabiners-Included/dp/B01M1EQCZO

I'd recommend this hammock instead. It's 11 feet long instead of 10 feet for the other one. Longer means it's easier for you to get a good, flat, diagonal lie. I have a 10 foot single and it's great when I need to go lighter or want to use my mummypod, but an 11 foot double hammock is waaaaay more comfortable with an underquilt and top quilt.

Cheap summer underquilt, good down to about 40: https://smile.amazon.com/OneTigris-Hammock-Underquilt-Lightweight-Packable/dp/B01N95BEZU

Any blanket or an unzipped sleeping bag will work, but if you want a dedicated one: https://smile.amazon.com/SnugPak-Jungle-Blanket-Survival-Polyester/dp/B07BGY8WW2

That snugpak blanket is probably a bit warm but easy to hang your feet or knees out of and let it vent.

Another thing you could do to save money is if your sleeping bag has two zippers you can unzip the foot end and run your hammock through the bag. Sleeping on top of your bag inside the hammock is pointless because you'll compress the insulation and get a cold butt. Running the hammock through the bag will force you to lay inline like a banana but you will probably stay pretty warm on the cheap. It's way more comfortable to use a dedicated underquilt, though.