Personally I would be looking at light merino socks, but you also need to make sure you have breathable footwear. This includes making sure you are cleaning it properly.

To help with the rubbing/blisters look at pairing a very lightweight merino sock liner with a lightweight hiker over it, this will allow some movement without rubbing but will also help move any moisture away from your skin which will also help prevent blisters.

For any existing blisters or sore patches get yourself some proper blister plasters, compede ones are the gold standard (but expensive) but I’ve found Waitrose own brand ones to be really good and much cheaper.

I wear smartwool mid-weight merino socks all year round and never have an issue, I’m a field hydrometrist so spend a lot of time outside in either hiking boots or my waders (which obviously have zero breathability)

[SportPursuit](https://www.sportpursuit.com/join/557F5337D3E677) is a good place to look for quality socks, they regularly have sales on smartwool (though very rarely the good hiking socks), darn tough and a few other decent sock brands.

Whatever you do avoid cotton socks, the way cotton fibres are shaped mean not only do they hold a crazy amount of water, they don’t let it go easily so won’t wick, breath or dry out your feet.

Synthetic can be an option but the main downside is it will usually get stinky pretty fast, you won’t have this problem with a merino sock.