not really relevant to the socks, but as for boot leaks, i took an old mtb trick for punctured mtb tyres and transfered it to my boots, i now carry a small piece of bike innertube with me (4") in my first aid kit, if i get a leak i use a piece of this and a bit of superglue, (aslo in my 1st aid kit) to patch it up, it works a treat especially with the weight of my body on it. top tip: carry a piece of innertube and superglue, job done