Burton Photon Step On® Snowboard Boots. Flex: Medium. Terrain: All Mountain, park, backcountry. - Sequence BOA® Fit System. - 1:1 firm flex PowerUp tongue. - Imprint 3 heat-moldable liner. - Total Comfort Construction. - Sleeping Bag Reflective Foil underfoot. - Step On® outsole. - EST® optimized midsole. - Vibram® Traction Lug outsole with EcoStep™ rubber.