Big Agnes Sidewinder 20 (650 RDS DownTek)
Big Agnes

Big Agnes Sidewinder 20 (650 RDS DownTek)

$349.95 $286.96 Save $62.99
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Sidewinder 20°
Traditional mummy bag optimized for side sleepers
Description

Specifically designed for the over 60% of people who sleep on their sides, the second generation of our 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. U.S. Patent 11957260 B2

Features
Side Sleeper Tech
Second generation side sleeper technology: 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
Footbox
Optimized profile and thermally efficient footbox is patterned to mimic body position while lying on your side
Down Fill
Down fill with a water-repellent finish throughout the bag provides lofty warmth
Body Mapped
Strategically placed synthetic insulation to provide padding and pressure relief at the knees, hips, and shoulders
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
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
Storage sack & stuff sack included
Materials
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
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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