Mountain Hardwear - Hyperlamina Spark 35D Bag

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Mountain Hardwear - Hyperlamina Spark 35D Bag

Availability: Out of stock

Stock #: 166Z-

The highest performance synthetic bag on the market. Thermally mapped insulation and half-length center zip maximize efficiency. Engineered to be the lightest and warmest synthetic bag on the market. Lamina™ construction welds the Thermal.Q® insulation to the shell and lining, eliminating the cold spots caused by traditional stitching. By mapping different insulation weights throughout the top of the bag we are able to concentrate warmth where you need it most – around your core and feet. Thermal efficiency is optimized by a performance mummy-cut, face gasket and single center half zip.


  • Engineered to be lightest and warmest synthetic bag available.
  • Proprietary welded Lamina™ construction enhances loft and eliminates cold spots
  • Zoned insulation maximizes warmth where it's needed most
  • Thermal.Q® insulation has outstanding compressibility and maintains excellent loft
  • Single #5 half length center zip with dual sliders minimizes weight and still allows for ventilation
  • Performance mummy cut is snug, reducing girth, weight, and bulk and maximizing thermal efficiency.
  • Comfort footbox follows natural foot position for maximum warmth and comfort
  • Ultralight shell is soft and highly wind resistant
  • Face gasket and tailored hood comfortably block drafts at the hood opening and seal in warmth
  • Sil-Nylon compression stuff sack and mesh storage sack included



  • Insulation: Thermal.Q™
  • Bag Shell: 22D Dobby


  • Apparel Fit: Regular-Sleep Bags
  • Weight: 1 lb 12 oz (Long) 1 lb 10 oz (Regular) 
  • Bag Shape: Performance Mummy Cut
  • Bag Loft: 3 in / 8 cm
  • Bag Stuff Size: 6 in x 13 in / 15 cm x 33 cm
  • EN Rating: T-LIMIT: 32 F / 0 C
  • EN Rating: T-COMFORT: 41 F / 5 C
  • Bag Fill Weight: 1 lb 0.4 oz / 567 g
  • Inside Length Long: 78 in Regular: 72 in
  • Hip Girth Long: 64 in Regular: 58 in
  • Foot Girth: 41 in / 104 cm
  • Shoulder Girth Long: 66 in Regular: 63 in

Additional Information

Additional Information

Temp Rating 35°F