Compact, roomy ultralight down-filled liner
The Sea to Summit Spark Sp0 mummy sleeping bag is an ultralight down-filled liner that can also be used on its own in warm weather. It features premium materials and no-frills design to provide cutting-edge performance.
Ultralight does not mean ultra-tight: The Spark mummy bags are snug but still have adequate girth for the performance-oriented backcountry user.