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- Best warmth-to-weight ratio
- High insulation
- Pleasant sleeping comfort
- top quality
The ultralight down sleeping bags in the Spark line from Sea to Summit have been in the top league for years. In last year's facelift, the Australian label made improvements, particularly in terms of sustainability: The shell is now made of highly breathable 10D recycled nylon, while the ripstop fabric used on the head and foot sections is highly water-repellent...