Do you suffer with cold feet while in your sleeping bag? Do you want something to put on your feet while sat in your tent or swinging in your hammock? Are you tired of spending the evening in the same wet socks you've had on all day? ... if you answered yes to any of those questions and don't want to look like you're on a surf safari in flip flops, then here's a possible solution ... Nanok Sleep Socks. Here, you can see Dennis modeling a M/L pair which would fit anyone with feet from 9-13 (they're roomy). A smaller size is available, which should please Dennis as he gets 2 paws in 1 sock, which obviously isn't so good for walking.
The insulation is synthetic hollow fibre and the outer is ripstop Pertex, so whilst not waterproof they are water resistant ... and if they do get a little damp it won't be the end of the world. Now the important bit, a pair weigh in at just over 140g and will compress down to about the size of a small orange, so they're not going to be a massive burden to pack/carry. So far I've tried them down to around minus 4 and my feet were very, very toasty but not uncomfortable.
The quality appears good as does the price, online you should be able to pick a pair up for under £20. Nanok also produce a 'Bivi Boot' which is higher and has a true sole, so might be a little more suited to wondering around camp looking for all the stuff you 'put safe'... but obviously they'll be a bit heavier.
*Socks mine, sofa models own