Mac in a Sac Alpine Down Vest
Featherweight Warmth for Alpine Adventures
Meet the Mac in a Sac Alpine Down Vest—your go-to lightweight mid-layer made for high-output activity in cold conditions. Whether you’re climbing, trekking, or chasing the sunrise, this vest delivers serious warmth without compromising on packability, breathability, or freedom of movement.
750-Fill Power Goose Down Insulation
Packed with premium 750-fill goose down, this vest provides exceptional warmth-to-weight ratio. The high loft traps heat efficiently while staying ultra-light, making it ideal for layering under a waterproof shell or wearing solo on crisp mornings. You’ll feel cozy on high ridges without carrying extra bulk.
Packable and Travel-Friendly
True to its “Mac in a Sac” name, the vest packs neatly into its own left-hand pocket. In just seconds, it compresses into a small pouch that fits easily in a pack or pocket. When weather changes, you can deploy it fast and stay warm on the move.
Designed for Movement
Constructed with stretch panels at the back and armholes, this vest adapts to your form as you climb or reach. The clean, sleeveless cut avoids bulk under harnesses or backpacks while retaining core warmth. Added shaped seams ensure comfort whether you’re layering, bending, or stretching.
Durable and Practical
The outer shell and lining use high-denier ripstop nylon treated with a durable water repellent finish. This resists light rain and snow, and stands up to abrasion in bush and alpine terrain. A full-length zip with internal storm flap seals in warmth and blocks out wind.
Thoughtful Features
Two zippered hand pockets secure essentials like gloves or buff, while the elasticated hem provides a snug fit that keeps cold drafts out. Reflective logo detailing boosts visibility in low light or early morning runs.
The Versatile Core Layer
Ideal for hikers, skiers, climbers, and backcountry explorers, this vest transitions from summit to camp with ease. You can use it as a warm mid-layer under a shell or outerwear, or as a standalone piece during brisk dawn patrols.
Ultra-light, packable, and purpose-built—the Mac in a Sac Alpine Down Vest keeps your core warm without slowing you down.
