The Patagonia R1 Pullover is a highly versatile, breathable, and compressible lightweight fleece jacket. Alpinists and backcountry skiers literally live in this layer. It's more breathable, more versatile, and packs smaller than the Patagonia R2. Get the R1 Hoody (our favorite R1 model) if you want a hood or the R1 Full-Zip Jacket if you want a longer zipper and handwarmer pockets.
Go for the Patagonia R2 Jacket if you want something warmer and something that looks better around town. If you're going for aesthetics and the cozy factor get the Mountain Hardwear Monkey Man 200.