As I mentioned when I gave the Speedweve a spin, I do not like classic darning. It take a lot of work to get right, the woven fabric isn’t as stretchy as a knit, and even in you use the same yarn, the repair is fairly obvious. That’s great for visual mending, but some times you don’t want to bring attention to your fix.
Enter, the knit darn! It’s been my go-to for ages, because it uses tools and skills I already had. You duplicate stitch two rows beneath the spot that needs mending, two stitches wider on either side. You then pick up stitches on a knitting needle, leaving the two stitch border on both sides. Continue duplicate stitching those borders and knitting in stockinette until you reach the top of the problem spot. Then, just secure all the live stitches, duplicate stitch two more rows, and voila!
It’s a repair that stands the test of time, because you’re essentially just reknitting the spot, and securing it to the original fabric in a construction that already exists. If you use the same yarn, it can be nigh invisible.
It even works on boot socks made out of slippery acrylic, and to prove it, I made a video. It’s just a quick overview of the technique, but I hope you’ll find it useful: