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Women's Sidewinder SL 35˚

Traditional Mummy Bag Designed for Side Sleepers

Specifically designed for those who sleep on their sides, the patent pending Sidewinder Series was engineered to ensure warmth, comfort, and ease of use no matter which side you’re on. Constructed with features you expect from a traditional mummy bag with additional body mapped insulation to optimize warmth where you need it and minimize pressure points and other ‘side effects’. The Sidewinder SL is a side sleeper’s dream bag with technical features that roll seamlessly from one adventure to the next, and from one side to the other at night. Our Women’s specific bags differ in shape and fill weight with a less drastic taper from shoulders, to hips, to feet - reducing cold spots and creating more warmth where it counts.
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W's Sidewinder SL Series

Specs + Sizing

Bag WeightPetite: 2lb 1oz / 936g / Regular: 2lb 3oz / 992g
Fill WeightPetite: 16.5oz / 466g / Regular: 19oz / 533g
Compressed Bag SizePetite: 5.5" x 6.5" / 14 x 16cm / Regular: 6" x 7.5" / 15 x 19cm
Stuff Sack SizePetite: 8" x 17.5" / 20 x 45cm / Regular: 8" x 17.5" / 20 x 45cm


Our Women's bags are designed to contour to your figure for the most thermally efficient and comfortable night's sleep

Specifically designed for women who sleep on their sides with a technical fit, patterned to move with you as you roll from one side to the other

Close fitting, jacket-style hood keeps insulation close to the body without sacrificing mobility

Keep pillow in place with unique Pillow Barn made of stretch mesh material with interior access from either side for easy adjustment

Optimized warmth and minimized pressure points with body mapped insulation

Improved shell fabric and lining with PFC-free water repellent finish

Down fill with a PFC-free water repellent finish throughout the bag provides lofty warmth while synthetic insulation helps alleviate common pressure points in the hips and feet

Optimized fit and thermally efficient footbox is patterned to mimic the shape of your foot position while lying on your side

Smooth, quick zip with anti-snag locking zipper with no draft zipper garage, and long, ambidextrous zipper

Easily adjust hood without unzipping using low-profile internal cordlock access

Seal out drafts by cinching insulated tube along upper hood opening

Hang dry or store bags with exterior loops

Storage sack & stuff sack included

Construction + Materials

Shell: nylon ripstop featuring a PFC-free water repellent finish

Lining: polyester taffeta featuring a PFC-free water repellent finish

Primary Fill: 650 fill DownTek™ repels water while maintaining insulating value - bluesign® Certified PFC free water repellent chemistry

Body Mapped Fill: FireLine™ ECO Synthetic Insulation, 100% post-consumer recycled polyester, featuring low-denier fibers that are tightly woven and provide high loft, compressibility, high weight-to-warmth ratio, and durability

Petite: fits up to 5'5" / 165cm

Regular: fits up to 5'10" / 178cm

Works with any pad size or style

Here’s what other people think.

What’s in a Name?

Here in the Western States, Rattlesnakes are common and dangerous. Sidewinders got their name for being sidewards-moving rattlesnakes, that only make contact with the sand in two small places on their body. This helps them move quicker and stay cooler by lifing their bodies off the hot sand. Side-sleepers, much like Sidewinders, make contact with the ground primarily in two places, the hips and shoulders. We developed the Sidewinder bags specifically to provide more comfort for side-sleepers, with strategically placed insulation to provide more comfort and warmth regardless of what position you wind up in.