Firm-flexing and responsive with the micro-adjustability of a BOA® Fit System. Season after season, the Ion sets the bar for responsive feel and out-of-the-box fit. The men's Burton Ion BOA® Snowboard Boots take it one step further with high-power micro-adjustable tensioning for the upper and lower boot. Combined with a firm flex, they support full-speed-ahead charging for riders who like to rip. Warm, dry feet and unmatched control for dropping lines and sticking landings are all yours. Firm, Supportive Flex It's full-speed-ahead with this boot's firm flex. Micro-Adjustable Fit A Dual-Zone BOA® Fit System lets you independently micro-adjust the fit and feel of the forefoot and upper boot for the just the right fit and feel. More Lacing Power Features BOA® dual high power system for more tensioning power and control of the instep and lower zone than other BOA® systems.