Snowbird™ Base 350 Down Mummy Sleeping Bag 40°F/ 4°C - Gray / M

A closer look

Snowbird™ Base 350 Mummy Sleeping Bag, versatile mummy sleeping bag with 650FP duck down and multi-mode zipper system — offering flexible ventilation options for backpackers who demand warmth without compromising on convenience. Key Features 650FP High-Quality Duck Down Insulation: Filled with 90% 650FP duck down, independently tested and certified with 683 fill power — delivering reliable warmth-to-weight performance for 3-season backpacking adventures. Multi-Mode Zipper System for Flexible Use: Innovative 3-way zipper design allows side-open, full-open, and foot-out modes — giving you quick access, maximum ventilation, or extra breathability without fully unzipping, adapting to changing conditions throughout the night. Professional Warmth Design: Features an insulated hood for head and neck warmth, wind-blocking strips to keep out cold drafts, a three-dimensional foot box for added comfort, and an inner pocket to protect your phone from cold temperatures. Advanced Down Retention Technology: Precision sewing with box-baffle construction and independent compartments prevent down from shifting or clumping — ensuring even distribution and consistent warmth without cold spots. Anti-leakage stitching keeps down securely in place. Compact Packability for the Trail: Includes three storage solutions — storage bag for loft preservation, stuff sack for travel, and compression sack for space-saving packability — so you can choose the right balance of volume and protection for your journey.