What Our Gearhead® Experts Are Saying:"This vest nails the balance between warmth and packability. The wool blend insulation feels natural and cozy, while the Merino panels stretch so you never feel restricted. I throw it on for hikes, travel, or even layering under a shell—it’s incredibly versatile."The Smartwool Smartloft Vest is built to bring lightweight warmth and easy mobility to cold-weather adventures. Insulated with a proprietary 50% recycled wool blend, it harnesses the natural thermoregulating power of wool while staying compressible and packable for on-the-go layering. A wind- and water-resistant recycled nylon shell offers reliable protection, while soft Merino-blend fleece side panels stretch for comfort and freedom of movement. The interior is fully lined with Merino wool to add breathable warmth where it matters most. Multiple zippered pockets provide space to stash essentials, making this vest just as functional on the trail as it is around town.