The Q36. 5 Gregarius Hybrid Alpi Camo Vest is a thermal cycling vest that covers the front, flanks, and back with tightly knitted, protective fabric. Its body-mapped pattern follows the path of cold air around the torso as the rider moves. What Our Gearhead(R) Experts Are Saying:"On rides that started cold and ended warm, the vest packed down small enough to stash once the chill burned off. The low-volume fabric stayed out of the way the whole time."