We meet the horizon and continue running the ridgeline while La Sportiva's Jackal II BOA(R) Trail Running Shoe staves off fatigue. The high-energy platform urges us onward, while the rock plate stabilizes and protects, ensuring every ounce of our energy is going into our stride. As the miles tick by, we click the BOA(R) Fit System dials a smidge to accommodate that long-run swell and thank the snug collar for doubling as a gaiter, so small sticks and stones don't crowd our feet inside.