Arcteryx Gamma Sl Hybrid Jacket Survey This jacket is great for spring and fall, and for light rain in summer. It is made of high quality stretchy material, wind proof, water resistant, soft, light weight and breathable. I once walked in a light rain, did not get wet at all. This jacket is perfect for the weather that morning is cold and afternoon is hot. So when the temperature is too high, you just take it off and put into your backpack since it weights just 9 ounce.