There are brand ones that are rather expensive, but at least in Europe I know that decathlon makes really cheap silk and cotton sleeping bag liners, because that's where I got mine.
They are made to go into sleeping bags, and I love mine for that use case (less sweat and dirt in your down bag), but I have also used them in dirt cheap hostels.
In one seedy hotel in Italy several people in my party had a lot of bedbug bites, but I can't say for sure if it actually protected me. I expect I was probably just lucky that there were none in my room.
Still, it's a little over 100 grams (less than 4 ounces) and it makes dirty mattresses in shitty hostels bearable.
They are made to go into sleeping bags, and I love mine for that use case (less sweat and dirt in your down bag), but I have also used them in dirt cheap hostels.
In one seedy hotel in Italy several people in my party had a lot of bedbug bites, but I can't say for sure if it actually protected me. I expect I was probably just lucky that there were none in my room.
Still, it's a little over 100 grams (less than 4 ounces) and it makes dirty mattresses in shitty hostels bearable.