Some boots and Loafers are leather not all of them. Most of their shoes are made in Spain with good quality. I would suggest you try them on before you buy them. Zara shoe sizes are not all the same and they vary for some reason.
They are perfect in summer. I tried wearing 888P, 880i last summer .....i could only last couple of hours in them as it gets really hot in Australia but 826D kept me cool on a nice summer day or evening.