A few years ago, I bought, on Ebay, a couple of what can best be described as British Army "beanies", labelled, from memory "Cap Field", or "Cap Combat".
They were brown in colour, and made of a very light and soft "fleece" material; the manufacturer was, I think, someone like Snugpak.
Since that time, they have vanished from the market - probably not robust enough - but I wondered whether anyone knows their nomenclature and / or manufacturer, so that I can buy another one (having lost the originals!)?