About this item
- 1. Hood Area：Integrated 3D thermal hood with drawcord.
Wraps around your head and seals gaps around the neck to prevent heat loss from the top.
Features an opening for the face; cinch the drawcord to leave only your face exposed for excellent wind resistance and heat retention.
Generous filling cushions the back of your head from hard ground, balancing warmth and comfort. - 2. Upper Torso (Shoulder & Chest Section)：The widest segment covering your chest and shoulders.
Roomy space for shoulders and chest, allowing freedom to roll over while resting.
Highest insulation fill protects your core vital organs to sustain body temperature.
Side zippers are usually fitted here for easy entry, exit and ventilation adjustment. - 3. Mid Torso (Waist & Hip Section)：Gradually tapered section matching your waist and hips.
Contoured to your waistline to cut down excess air space inside the bag.
Less trapped air means your body heats up the interior faster and reduces heat dissipation.
Accommodates hip movement with a good balance of snug fit and comfort. - 4. Lower Leg Section：Continues tapering to fit thighs and calves.
Classic mummy-shaped taper that follows leg contours.
Minimizes redundant space to save weight and boost thermal efficiency.
Restricts cold air circulation inside the bag and stops cold drafts creeping upward along legs. - 5. Foot Box (Bottom Section)：Closed, 3D foot compartment at the very base.
Spacious foot box lets you bend legs naturally without compressing down.
Reinforced thick insulation for feet, which tend to get cold easily due to poor peripheral blood circulation.
Fully sealed construction to block cold air leakage from the bottom.
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