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: - 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 - 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 - 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