Hi Mike,
They are the heavyweight wading socks, I have them too. They must be good, I sent a pair to Magnus, even he rates them. Fleece trousers £4.99 from Lochinver hardwaer store before it went upmarket, best buy I've ever made. Still wearing my black Orvis windproof fishing fleece, it won't wear out and is the most windproof warm fleece I've ever owned.
Was out today, very cold indeed.
Ben