Sweating. Freezing. Sweating. Freezing. How do you reach the middle ground between insulation and ventilation? Mammut's answer is the Madra Hybrid Jacket, a low-profile mid-layer jacket that features Ajungilak OTI Element synthetic insulation in the chest, back, shoulders, and top of the arms, while the side panels and undersides of the arms are made of stretchy, breathable Polartec Power Stretch. The result is a low-profile mid-layer that provides insulation in all the right places and ventilates where you need it most.