Sleeping bag options for warmer weather

I've been thinking about lighter weight options for over the summer months and wonder what other people use? It would be lucky, but possible during a cold change, to get down to around 10° or so at night where I live, in the sub-tropics, during summer. Both my sleeping bags are rated to below zero, overkill for this and weigh either 1 or 2 kilos, which I figure is an ideal weight to leave in the cupboard if possible. Plus I'm sick of kicking them off only to get cold and then pull thgem back up and then kick them off, etc etc
I began thinking that a nice heavy cotton flannel sheet might do the trick, a double or queen could be doubled over if it got cool enough & it'd be a cheap option too or maybe a light fleece blanket would be an option. I also, briefly, thought of making a light weight down quilt, but I realised that was only because I've been reading too many backpacking blogs about MYOG/DIY instead of an actual desire to make one
because, as mentioned, I can't sew and it would probably end up being an exercise in pain and futility. And the cost, I should mention that if I could afford it I would buy one of those slick lightweight quilts made by one of the overseas 'cottage manufacturers'.
While searching for flannel sheets I came across this silk liner which sounds pretty nice. Its got plenty of room and they make silk sound amazing, plus it can be used by iteslf or inside a sleeping bag for a temperature boost during winter and to help keep the bag clean. I'm almost sold, does anyone use and/or rate these? is silk really the wonder material its made out to be? I'm guessing silk, unlike a cotton or synthetic liner, would tangle up a lot less too which is a big deciding factor for me and a reason I own semi rectangular sleeping bags instead of mummy shaped bags, is this the case?
And then i found all these and now I'm completely confused... Cotton liners, fleece liners (sounds cosy but 580 grams isn't much of a weight saving), reactor liners (claimed 8 degree temperature boost! whch I've read is a 'generous' claim), etc etc...
I'm interested in hearing what the warm weather campers use and any pros, cons or general advice would be appreciated
I began thinking that a nice heavy cotton flannel sheet might do the trick, a double or queen could be doubled over if it got cool enough & it'd be a cheap option too or maybe a light fleece blanket would be an option. I also, briefly, thought of making a light weight down quilt, but I realised that was only because I've been reading too many backpacking blogs about MYOG/DIY instead of an actual desire to make one

While searching for flannel sheets I came across this silk liner which sounds pretty nice. Its got plenty of room and they make silk sound amazing, plus it can be used by iteslf or inside a sleeping bag for a temperature boost during winter and to help keep the bag clean. I'm almost sold, does anyone use and/or rate these? is silk really the wonder material its made out to be? I'm guessing silk, unlike a cotton or synthetic liner, would tangle up a lot less too which is a big deciding factor for me and a reason I own semi rectangular sleeping bags instead of mummy shaped bags, is this the case?
And then i found all these and now I'm completely confused... Cotton liners, fleece liners (sounds cosy but 580 grams isn't much of a weight saving), reactor liners (claimed 8 degree temperature boost! whch I've read is a 'generous' claim), etc etc...
I'm interested in hearing what the warm weather campers use and any pros, cons or general advice would be appreciated