Don't buy Hi-Tech!!! Sorry if there are any Hi-Tech people about to reply to this comment, but don't! I bought the Horizons, and wore them around for a while (about 4 months), so they'd be 'broken in', but when I did my C2C walk I had blisters from day 2! I did it in 12 days!
I later found out two main reasons. They weren't waterproof, (well technically they were, but only for about 1 hour), and also when someone took out the insole (which is wafer thin), the sole had a criss-cross structure under the material. The kind of thing you get in cheap Nike-Air look-alikes. I would always recommend against Hi-Tech's now.