Big Agnes Sidewinder SL 20 (650 RDS DownTek)
Big Agnes

Big Agnes Sidewinder SL 20 (650 RDS DownTek)

$249.95 $204.96 Save $44.99
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Sidewinder SL 20°
Traditional mummy bag designed for side sleepers
Description

Specifically designed for those who sleep on their sides, the patented 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. U.S. Patent 11957260 B2

Features
Side Sleeper Tech
Specifically designed for people who sleep on their sides with a technical fit, patterned to move with you as you roll from one side to the other
Hood
Close fitting, jacket-style hood keeps insulation close to the body without sacrificing mobility
Pillow Barn
Keep pillow in place with unique Pillow Barn made of stretch mesh material with interior access from either side for easy adjustment
Body Mapped
Optimized warmth and minimized pressure points with body mapped insulation
PFAS Free
Improved shell fabric and lining with water repellent finish without intentionally added PFAS
Insulation
Down fill throughout the bag provides lofty warmth while synthetic insulation helps alleviate common pressure points in the hips and feet
Footbox
Optimized fit and thermally efficient footbox is patterned to mimic the shape of your foot position while lying on your side
Zipper
Smooth, quick zip with anti-snag locking zipper with no-draft zipper garage, and long, ambidextrous zipper
Hood Adjustment
Easily adjust hood without unzipping using low-profile internal cordlock access
Draft Protection
Seal out drafts by cinching insulated tube along upper hood opening
Storage Loops
Hang dry or store bags with exterior loops
Storage
Storage sack & stuff sack included
Materials
Shell
Nylon ripstop featuring a water repellent finish without intentionally added PFAS
Lining
Polyester taffeta featuring a water repellent finish without intentionally added PFAS
Primary Fill
650 fill DownTek™ repels water while maintaining insulating value - bluesign® approved water repellent chemistry without intentionally added PFAS
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
Regular
Fits up to 6' / 183cm
Long
Fits up to 6'6" / 198cm
Pad Compatibility
Works with any pad size or style
Storage
Guidelines
Keep your bag hanging if possible, or in its included mesh storage sack. Store in a cool, dry place away from heat sources.
Cleaning
Note
Even dirtbags wash their bags!
Machine Wash
Machine wash in a washing machine WITHOUT AN AGITATOR, agitators are likely to cause damage to your gear
Oversized Bags
Oversized bags require oversized machines, you may need to go to a laundromat to wash your larger bags
Cycle
Wash on a warm, gentle cycle
Soap
Use gear specific soap, we recommend Nikwax Down Wash Direct
Rinse
Rinse twice
Dry
Tumble dry low heat with clean tennis balls
Finish
Finish by drying on high heat in 5 minute intervals to loft down. Allow to cool between intervals to avoid damage to shell.
Important Notes
Warnings
Do not use fabric softeners. Do not bleach. Do not iron. Do not dry clean.
Repairs and Warranty
Coverage
All Big Agnes gear is guaranteed against manufacturing or material defect. We do not warranty products damaged from normal wear and tear, alteration made by owner, misuse, accidents, or damages caused by uses other than intended. Damage due to misuse, normal wear and tear, or improper care may be repaired, at the discretion of Big Agnes, at a reasonable charge. Gear returned for repair must be clean and free of debris.

Shipping Policy

Components:

All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 1–4 business days of purchase.

Bicycles:

Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.

Riding Gear & Apparel:

Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 1–3 business days.

Returns & Exchanges:

If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.

For full details, please see our Refund Policy before initiating a return.

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Prepared with intention.

Every product is carefully inspected and handled by our team before it ships. From fit and function to final details, we make sure each piece is ready for the outdoors ahead—so you can focus on the experience, not the gear.

Passion drives us

At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.

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