Burton Photon BOA® Snowboard Boots. Flex: Medium. Terrain: All-mountain, park, backcountry. - Dual-Zone BOA® Fit System with Coiler™ and Lockdown technology. - GripLITE backstay. - 1:1 firm flex PowerUp tongue. - Hi-back construction. - Total Comfort Construction with a wider fit. - Imprint 3 heat-moldable liner. - Sleeping bag reflective foil underfoot. - B3 Gel cushioning. - Vibram® Traction Lug outsole with EcoStep™ rubber. - EST® optimized midsole.