Traditional Mummy Bag Optimized for Side Sleepers

Specifically designed for the 60%+ of people who sleep on their sides, the second generation of patented Sidewinder technology delivers warmth, comfort, and ease of use in any position. Built with body-mapped insulation, it provides warmth where you need it most while adding cushioning at the hips and shoulders to reduce pressure points.

The Sidewinder is a side sleeper’s dream—engineered to move with you as you roll from one side to the other, seamlessly adapting from one adventure to the next.
U.S. Patent 11957260 B2

Features

• Second-generation side sleeper design with a technical fit that moves with you
• Optimized profile and thermally efficient footbox shaped for side sleeping position
• Down insulation with water-repellent finish for lofty warmth
• Strategically placed synthetic insulation for cushioning at knees, hips, and shoulders
• Close-fitting, jacket-style hood for warmth without restricting movement
• Pillow Barn system:
  • Stretch mesh keeps pillow in place
  • Interior access from either side for easy adjustment
• Smooth, anti-snag locking zipper with no-draft zipper garage
• Long, ambidextrous zipper for flexible use
• Low-profile internal cordlock for easy hood adjustment without unzipping
• Insulated tube along hood opening to seal out drafts
• Storage sack and stuff sack included

Specs

• Total Weight: 2 lb 4 oz
• ISO Comfort: 30°F
• ISO Limit: 19°F
• Fill Weight: 14 oz Down + 6 oz Synthetic
• Compressed Size: 9.5" x 8"
• Stuff Sack Size: 14L | 8" x 17.5"
• Max User Height: 5'6"
• Recommended Pad: Works with any pad size or style
• Shoulder Girth: 58"
• Hip Girth: 52"
• Foot Girth: 33"

Materials & Construction

• Shell: Recycled polyester ripstop with water-repellent finish (no intentionally added PFAS)
• Lining: Recycled polyester taffeta with water-repellent finish (no intentionally added PFAS)
• Primary Insulation: 650 fill DownTek™ (PFC-free, bluesign® certified water-repellent chemistry)
• Body-Mapped Insulation: FireLine™ ECO synthetic (100% post-consumer recycled polyester)
  • Low-denier fibers for high loft, compressibility, durability, and warmth efficiency

Down Sleeping Bag Care

Storage

• Store uncompressed (hang if possible or use included mesh storage sack)
• Keep in a cool, dry place away from heat sources

Cleaning

• Machine wash without an agitator
• Use oversized machines if needed (laundromat recommended for large bags)
• Wash on warm, gentle cycle
• Use down-specific soap (e.g., Nikwax Down Wash Direct)
• Rinse twice
• Tumble dry low with clean tennis balls
• Finish drying on high heat in 5-minute intervals to restore loft
  • Allow cooling between intervals to prevent damage

Do Not:

• Use fabric softeners
• Bleach
• Iron
• Dry clean

Repairs & Warranty

• Guaranteed against manufacturing and material defects
• Not covered:
  • Normal wear and tear
  • Owner modifications
  • Misuse or accidents
  • Use outside intended purpose
• Repairs may be available at a reasonable cost
• Returned gear must be clean and free of debris