Pro Atomic has long had a reputation for powerful boot designs. The M series uses Tri-Tech construction, which separates the toe and heel lugs from the body of the shell with a floating stabilizer to provide a spot-on sweet zone. What Atomic had lacked, however, was the envelopment and smoothness that the best boots in this category provided. No longer. This year the M boots scored their top marks in Closure System and Skiing Comfort, as two years of liner and buckle refinements continue to pay off. Neither M series model we tested flinched from responsibility. If you find yourself in the back seat, it's definitely operator error, not a design flaw. "This is a firm boot best suited for strong, big skiers," said Gleason. "The high-volume cuff dampens precision for those who don't fill it up." Con Tight Achilles pocket snaps at heel on exit. Top Scores Closure System 3.6, Skiing Comfort 3.5, Adjustability 3.4