Sidewinder 20 (650 RDS DownTek) eclipse If you want a technical

If you want a technical pack that can do it all

A dialed-in precise fit makes for a sock that won't quit

Blinker Light Attachment

Adding up to 4°C|7°F of warmth with minimal bulk

Sidewinder 20 (650 RDS DownTek) eclipse If you want a technicalSpecifically 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