Mountain Equipment Company

Big Agnes Sidewinder SL -7C Down Sleeping Bag - Women's


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A cozy mummy style bag for the side sleepers among us. Designed from the ground up for side sleepers, the Sidewinder uses an innovative cocoon pattern to get you a great night’s sleep. The SL version uses a body-mapped blend of down and synthetic insulation keeping coziness where it counts. And, the blanket like hood has hand pockets in the corners, so you can tuck yourself in just like you would at home.

  • Shell is lightweight nylon, lining is soft polyester microfiber, and both have a water-repellent finish
  • 850 fill DownTek™ uses a Bluesign™ approved chemistry to treat for water-repellency, has antimicrobial and antibacterial protection, and is sourced under the Responsible Down Standard
  • FireLine Eco insulation is composed of 100% post-consumer recycled polyester. Low denier fibres are tightly woven to provide high-loft, compressibility, a high weight-to-warmth ratio and durability
  • Synthetic insulation is used at the hips and in the foot box, this reduces common cold spots for side sleepers
  • Cocoon design keeps side sleepers cozy by keeping insulation close to the body
  • Horizontal baffles create tunnels of warmth that wrap around your body, and prevent insulation from shifting and creating cold spots
  • Draft flap behind the ambidextrous, anti-snag locking zipper ensures cold air doesn't sneak in
  • Optimized footbox mimics the natural position of your feet when lying on your side
  • Hood lets you lift and move your head, even when fully zipped up and has a one-handed cinch adjustment
  • Stretch-mesh pillow pocket keeps your pillow right where you want it
  • Hang loops let you air it out in the sun
  • Includes a mesh storage bag and a nylon stuff sack
  • Women's version is wider at hip, narrower at shoulders, with extra insulation at chest and feet

Tech specs

Weight1.11kg (Petite Right Zip)
1.19kg (Regular Right Zip)
Ideal for
  • Backpacking
  • 650 fill-power water-repellent goose down
  • Synthetic
634g (Petite Right Zip)
700g (Regular Right Zip)
  • DownTek
  • FireLine
  • Offset quilt
Face fabric
  • Nylon ripstop
  • Polyester
Packed size18 x 20cm (Petite Right Zip)
19 x 20cm (Regular Right Zip)
Shoulder girth142cm (Petite Right Zip)
147cm (Regular Right Zip)
Hip girth137cm (Petite Right Zip)
142cm (Regular Right Zip)
Foot girth79cm (Petite Right Zip)
84cm (Regular Right Zip)
Additional feature(s)
  • Draft tube behind zipper
  • Interior pocket(s)
  • Stuff sack included
  • Pillow pocket
  • DWR-treated shell fabric
Product sustainability
  • Certified Responsible Down
  • Bluesign® Approved Material
  • Recycled content
Made inChina


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