I don't have the Anorak but I do have the Vellus jacket and pants, which are made of the same fabric. The waterproof, wind proof, insulated fleece used in the Vellus is very warm. I've been using the set when tree stand hunting November whitetails and it was good for that. I was riding my mountain bike back into a river bottom and even in temps near zero, I had to carry the Vellus stuff so I wouldn't be sweaty. I'm not sure if the Anorak has less insulation or not, but if it's the same, then I'd say this is really meant to be a cold weather piece. I'm going to be chasing rabbits in snow shoes next week with my son and will be donning the Vellus for that as well.