THE INCUBATOR Insulator is the most versatile insulator in the Strafe line-up and has become a trusted partner in the mountains for our athletes. We chose to fill the Incubator with Primaloft Gold because this synthetic insulation is incredibly lightweight, fast-drying, and most importantly, the warmth-to-weight ratio is hard to beat. The Incubator performs great as summit insulation, a warmer mid-layer on very cold days, or if you're like us, you'll wear it around town from October to May.