Maxi-Lock Stretch Thread 2,000 yds - #32109 White

Is this thread comparable to woolly nylon thread? I've read I need woolly nylon in my bobbin for using a twin needle, to keep from skipping stitches.

Will this work for shirring fabric?

Is this thread good for mending a sock?

Is this thick enough to hand sew across knee holes that are too big now on jeans ??? need stretchy ty