Mountain Hardwear Lamina Z Spark Sleeping Bag

Traditional sleeping bags are stitched, which creates tiny holes where heat can escape. The Lamina Z Spark uses welded seams instead, which eliminates those cold spots and keeps the synthetic insulation lofted more consistently across the entire bag.

Yes, it is a great choice for wet environments. The shell is water-resistant, and because it uses Thermal.Q synthetic insulation rather than down, it retains its ability to keep you warm even if it gets damp.

The comfort mummy cut is designed to be slightly roomier than a traditional, tight-fitting mummy bag. It balances thermal efficiency with enough space to move your legs, making it a good middle ground if you find standard mummy bags too claustrophobic.

With a 34°F temperature rating, this is a solid 3-season bag. It is ideal for mild spring and autumn nights, but if you are camping in temperatures near or below freezing, you may want to pair it with a high-R-value sleeping pad or a liner.

The footbox is shaped to follow the natural position of your feet when you are lying on your back. This prevents your feet from compressing the insulation against the bottom of the bag, which helps keep your toes warmer throughout the night.

The Lamina Z Spark accommodates users up to 84 inches, or 7 feet tall. If you are near that height, you will have enough length to fully extend without feeling cramped.