Down Mummy Sleeping Bag with professional thermal design: The thickened three-dimensional windproof barrier effectively prevents cold spots caused by zipper gaps. The windproof strip design tightly wraps around the hood, while the external cold lip blocks convection. The U-shaped collar provides superior neck warmth. Internal pockets accommodate mobile phones and small items, preventing frostbite. Every detail keep your thermal insulation.

C-Shaped Envelope Design: This sleeping pad features a C-shaped envelope construction with a U-shaped hood and YKK two-way zipper. The 6:4 top-to-bottom ratio allocates more down coverage to the upper body, maintaining warmth and comfort while reducing heat loss in harsh conditions. 3D foot space allows greater freedom of movement for feet.

Selectable sizes and temperature ratings: Three models available – SP400/SP700/SP1000 – corresponding to comfort temperature ratings of 38.84/18.86/12.55°F. Each model comes in short and regular lengths: 74.8 x 29.5 inches and 80.7 x 31.5 inches respectively. Please consult the size chart for precise packed dimensions and weights per model. Select the sleeping bag suited to your outdoor temperature conditions.

Usage tip: To keep the sleeping bag's warmth, we recommend unfolding it before use to fluff the down. Store the sleeping bag before departure to maintain its loft. For optimal warmth, we recommend pairing the sleeping bag with a sleeping mat.