What Our Gearhead® Experts Are Saying: "I’ve used the Stacker as a midlayer for cold ski days and as a standalone piece for crisp fall hikes. The merino insulation keeps my core warm without overheating, and the nylon face fabric gives it just enough weather resistance for light snow or wind." We grab the Mons Royale Stacker Merino Insulated Vest when we want extra warmth for our core without the bulk of sleeves. The lightweight merino wool insulation naturally regulates temperature, wicks moisture, and stays warm even when damp—perfect for layering under a shell on storm days or wearing over a hoodie on cool evenings. A durable nylon face fabric resists light wind and moisture, while the streamlined fit makes it easy to pack and layer. Whether we’re chasing powder in the backcountry, spinning the bike on shoulder-season trails, or relaxing at camp, the Stacker is a versatile layer that works across seasons and settings.