Hello! I have narrow feet with very flat arch, but I’m size 37/UK4. I don’t see anyone else on the Camino with my trail runners but my friends back home and I wear this a lot and he wears it for mountaineering etc.
I find my shoe+insole+sock combination to be a good balance in terms of support against all the road walking (one day from Sobrado to A Brea-> past Arzua, it was essentially 32km all road/asphalt), as well as great for all the ups and downs on the Salvador/Primitivo, the hard toe caps were useful on those rocky downhills to Montefurado and Grandas de Salime!
I’m very lucky, zero blisters, no other physical injury.
I use Arcteryx:
https://www.arcteryx.com/es/en/shop/womens/konseal-fl-2-leather-gtx-shoe
Konseal is the slim model you’d wanna go for. I use the fast and light (FL), there’s also all round (AR). There is leather vs non-leather and goretex vs non-goretex.
With this insole:
CURREX HikePro insoles: When hiking, every step has to fit: CURREX HikePro insoles, therefore, give you exactly the security you need. The CURREX HikePro is your comfort booster for hiking and walking. How does it work? Find out more about CURREX HikePro here.
The insole is quite thick so it will make the space in the shoe a bit smaller. So I went up a size to 38.
With this pair of socks: ultralight T2 merino sport 3/4 crew
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There’s a lot of talk about shoes, but good socks are very important too. I have found this pair to be very breathable so my feet never sweat even when it was hot. I tried smartwool socks but to me they were so soft like indoor slippers, and didn’t give support. My current socks feel very snug and has extra cushion on the balls of feet, the arch, and the metatarsal part that sometimes get pressure/marks from shoelaces.