Lightweight and breathable, the Jackal II BOA Trail Running Shoe helps us stay nimble on high-mile trail runs without compromising all-terrain protection and durability. La Sportiva updated the second installment of the Jackal with a BOA fit system closure for a dynamic lock-in and a highly breathable gaiter that keeps the shoe interior pebble-free. Customer feedback suggests this shoe runs small, we would suggest sizing up if you are unused to a tight performance fit.