Just over 50% cotton and available in mens and wummins fit.
Cheaper than elsewhere when postage is taken into account - and still quite competitive even disregarding that.
For the benefit of the hard of thinking - this pack contains six socks, and is not available online, its just instore, so there is no point in clicking on the "go to deal" link and then posting you cannot find it!!!
They are in the camping section of the shop, and not in the clothing/George bit.
They look nothing like the picture, as not being online there was no picture to copy, so I added these rather fetching ones that someone's mum has knitted.