ThirtyTwo Men's Shifty BOA Snowboard Boots Ride in comfort all day with the Shifty. Built to be a pillow on your feet with a cushy Comfy Tongue, soft Evolution Foam outsole and plush Comfort Fit liner it's the perfect boot to ride from first chair to last. BOA® Fit System delivers micro-adjustable, precision fit, engineered to perform in the toughest conditions. BOA® Fit System Evolution Outsole Comfy Tongue Internal Lacing System Heel Hold System Flex: Soft 4/10