Merino wool shirts are very nice! You may already own some or have seen advertisements on them. So, my husband and I are a big fan of merino wool.
A downside is that some of them are rather thin and easily ripped... So, I mend the holes.
Mending is done by hand with a blunt needle (or also called ball-point needle). I decided to use 100% cotton thread rather than polyester thread just because merino wool seem to be a little fragile than polyester fabric.
This hole was rather jagged on its edges, so I cut it into a shape that was easier to sew.
Let's see how long the mend will last...
You can also see a tiny hole I filled without a backing, too.