This is a Coolmax sleeping bag liner, treated with Insect Shield whixh means it makes for a good speing through fall bag, all on its own.
Offered in Mummy and Traveller styles. Yep, it’s in that bright Green color.
seatosummitusa.com/products/adaptor-coolmax-liner-insect-shield
I bring one of these when I go to Kenya. Even though the bunks have bed nets, this makes me a little more confident I wont get malaria – and it’s nice to have in between me and the mattress that lots of other people have slept and sweated on. It’s t-shirt weight, which is also just enough for sleeping in equatorial heat.