The Black Diamond Hot Forge Hoody uses the top Primaloft down blend, which is 70% water-repellent down/30% Primaloft.  The insulation really does feel like a cross between down and synthetic with a slightly slick synthetic feel but also the softness and flexibility of down. I find it very comfortable and quite breathable. It also loses little loft when wet and dries quite quickly, aided by the thin Pertex Quantum shell. This jacket has a good hood with a small peak and a volume adjuster. The lower pockets are roomy but lie under a hipbelt, as do the inner pockets. The lower pockets are lined with fleece, as is the collar, a nice touch. Sizing is on the small side with the medium a rather tight fit worn over a lightweight fleece. The price is quite high but the weight is reasonable. The warmth means this top should be adequate for all but the coldest UK winter conditions.