Hey, mending people? I have these cotton knee socks that have a thinning bit under the heel that I'd rather darn before it becomes a hole, but am uncertain about what to use. I have a cat that eats yarn so ideally I'd use any and all of the cotton thread I have, but is there some trick to it?
Doubled up thread, double-double thread? I'd assume you'd just darn as normal, just smaller, but does anyone have direct experience?

#Mending