
Product Description
Traditional mummy bag optimized for side sleepers. Specifically designed for the over 60% of people who sleep on their sides, the second generation of the patented Sidewinder side sleeper technology ensures warmth, comfort, and ease of use in any position you settle into. Constructed for comfort, with additional body mapped insulation to optimize warmth where you need it and provide cushioning and support at the hips and shoulders, easing pressure points and other ‘side effects’. The Sidewinder 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. Optimized profile and thermally efficient footbox is patterned to mimic body position while lying on your side.
- Down fill with a water-repellent finish throughout the bag provides lofty warmth
- Strategically placed synthetic insulation to provide padding and pressure relief at the knees, hips, and shoulders
- 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
- 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
- Storage sack & stuff sack included
- Total Weight: 2 lb 7 oz
- ISO Comfort: 30°F
- ISO Limit: 19°F
- Total Fill Weight: 15oz Down + 6.5oz Synthetic
- Compressed Bag Size: 10" x 8"
- Stuff Sack Size: 14L 8" x 17.5"
- Max User Height: 6'
- Recommended Pad Size: Works with any pad size or style
- Shoulder Girth: 61"
- Hip Girth: 55"
- Foot Girth: 36"
- Shell: Recycled polyester ripstop featuring a water-repellent finish without intentionally added PFAS chemicals
- Lining: Recycled polyester taffeta featuring a water-repellent finish without intentionally added PFAS
- Primary Fill: 650 fill Downtek™ PFC-Free repels water while maintaining insulating value, with bluesign® Certified 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
- Machine wash in a washing machine WITHOUT AN AGITATOR, agitators are likely to cause damage to your gear
- U.S. Patent 11957260 B2
Availability & Sizing
Product Details
Price History
Historical Data
Last 1 days of price history
| Date | Low Price | High Price | Average Price | Vendors |
|---|---|---|---|---|
| May 8, 2026 | $329.95 | $329.95 | $329.95 | 1 |
Price Statistics
Description
Traditional mummy bag optimized for side sleepers. Specifically designed for the over 60% of people who sleep on their sides, the second generation of the patented Sidewinder side sleeper technology ensures warmth, comfort, and ease of use in any position you settle into. Constructed for comfort, with additional body mapped insulation to optimize warmth where you need it and provide cushioning and support at the hips and shoulders, easing pressure points and other ‘side effects’. The Sidewinder 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. Optimized profile and thermally efficient footbox is patterned to mimic body position while lying on your side. Down fill with a water-repellent finish throughout the bag provides lofty warmth Strategically placed synthetic insulation to provide padding and pressure relief at the knees, hips, and shoulders 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 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 Storage sack & stuff sack included Total Weight: 2 lb 7 oz ISO Comfort: 30°F ISO Limit: 19°F Total Fill Weight: 15oz Down + 6.5oz Synthetic Compressed Bag Size: 10" x 8" Stuff Sack Size: 14L 8" x 17.5" Max User Height: 6' Recommended Pad Size: Works with any pad size or style Shoulder Girth: 61" Hip Girth: 55" Foot Girth: 36" Shell: Recycled polyester ripstop featuring a water-repellent finish without intentionally added PFAS chemicals Lining: Recycled polyester taffeta featuring a water-repellent finish without intentionally added PFAS Primary Fill: 650 fill Downtek™ PFC-Free repels water while maintaining insulating value, with bluesign® Certified 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 Machine wash in a washing machine WITHOUT AN AGITATOR, agitators are likely to cause damage to your gear U.S. Patent 11957260 B2
Additional Info
Vendor Comparison (1 stores)
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| Vendor | Price | Stock | Last Updated | Action |
|---|---|---|---|---|
Sports Basement Best Price | $329.95 | Out of Stock | 5/8/2026 | View Product → |
Available Sizes & Variants (1)
| Variant | Size | Color | Price | Status | Stores | Buy |
|---|---|---|---|---|---|---|
Chinois Green/Mercury/Primrose / Regular | Regular | Chinois Green/Mercury/Primrose | $329.95 | In Stock | 1 store | Buy |



