This upgraded basic suits all weather, flexing between an under and outer layer. Ultra-light with a slightly roomier fit ideal for layering, it performs as a standalone piece on mild days or under shells in colder temperatures when you need extra warmth. The M1 Zip Up Hoodie easily transitions through the day and regulates body temperature as activity levels rise, just unzip or roll up the sleeves to cool down. The four-way stretch fabric is treated with an anti-pilling agent to resist abrasion when in contact with tree bark or the rough materials of a harness or tool belt.