The Sidewinder SL Sleeping Bag is a 20°F-rated bag designed for side sleepers. It uses body-mapped synthetic insulation to relieve pressure on hips, knees, and shoulders, with 650-fill DownTek down for lightweight, moisture-resistant warmth. The hybrid shape allows natural movement without cold spots. Made with recycled polyester shell and lining featuring a PFAS-free water-repellent finish, it has a close-fitting hood and insulated footbox for efficient heat retention. Suitable for shoulder-season backpacking and cooler nights at elevation.