Based on the design of the category leading Alien 1.0, the Alien offers much of the same technology at a far more affordable price. Itâ€™s build for amateur racers, people who want a traning boot, or the speed-savvy backcountry skier who wants the ultimate in light weight. Offering all of the same features of the Alien in a full polyamide boot, the Alien uses the BoaÂ® Closure System on the exterior of the ski boot for immediate adjustments. This on-the-fly closure technology is extremely light, and provides a glove-like fit for top performance, comfort and speed in a variety of conditionsâ€”up and down. It weighs in at 879 grams per boot (size 27).