FILLING MATERIAL: Filled with 650 fill power duck down; square baffle box construction evenly distributes filling to reduce down shifting and clumping; SP400/SP700 multiple fill weight options match different outdoor temperature demands OUTER & LINING FABRIC: Made of 20D ripstop nylon with DWR water-repellent coating; resists surface dew and light dampness outdoors; dense stitching minimizes down leakage and delivers soft skin-friendly touch for all-night rest FULL WIND LOCK WARMTH DESIGN: Equipped with dual anti-draft strips alongside two-way YKK anti-snag zipper; adjustable U-shaped hood and saddle neck collar seal cold air out; spacious 3D foot box relieves foot compression for steady heat retention ULTRALIGHT & COMPACT STORAGE: SP400 M size weighs only 820g; mummy tapered shape cuts extra weight; rolls into slim cylindrical form that fits most backpacks and car trunks; matched compression sack included for space-saving packing HUMANIZED PRACTICAL DETAILS & VERSATILE CHOICES: Inner small pocket stores phone or headlamp; separate foot zipper for adjustable ventilation; M/L two lengths and Smoke Brown/Burnt Tea neutral colors available; fits hiking, camping, road trips and temporary overnight stays

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