Repairing merino shirts

Hi,
I'm just looking for some advice on how to repair some holes and worn areas in my two main shirts for hiking. Most of the damage is on the shirt I use to walk in which is an Icebreaker Aero half zip made from 120 weight merino and the other I have is a 200 weight merino long sleeve. I'm new to sewing and repairing my gear, but I'd rather fix them now before the problem gets so bad I need to replace them completely.
I have two main questions: 1) What method would you use to repair them; and 2) What material would you use to fix them and where would eb the best place to source materials from.
I have included some photos of the different sorts of damage on the Aero half zip.
Cheers,
whitefang.
I'm just looking for some advice on how to repair some holes and worn areas in my two main shirts for hiking. Most of the damage is on the shirt I use to walk in which is an Icebreaker Aero half zip made from 120 weight merino and the other I have is a 200 weight merino long sleeve. I'm new to sewing and repairing my gear, but I'd rather fix them now before the problem gets so bad I need to replace them completely.
I have two main questions: 1) What method would you use to repair them; and 2) What material would you use to fix them and where would eb the best place to source materials from.
I have included some photos of the different sorts of damage on the Aero half zip.
Cheers,
whitefang.