I asked the team at Finisterre for some advice on the comparison between the Nebulas and the Nimbus jackets. Based on the response that I had I plumped for the Nebulas and it is fantastic. I find it a bit warm for walking the dog, but that's just me. However, on a cold day when I'm not that active it is perfect. It's light and folds quite small too. Another great Finisterre product.