From the website: Climbing outside in fall and spring can be a balancing act between staying warm and staying at the crag. With the Patagonia Women's Performance Better Sweater Fleece Jacket, you're able to cut the chill and climb on without peeling your jacket off. And while you may be thinking that the Performance Better Sweater bears a striking resemblance to its big sister, this jacket differentiates itself with a lighter material and Polartec Power Stretch side panels that wick moisture, dry quickly, and assure unobstructed mobility.