You can choose between the single or dual component Power Spine backstay, which allows you to fine-tune medial/lateral support and edge-to-edge response. Features that are new for the 2011 Ambush are the Dynolite EST outsole (which reduces the boot's weight 20% from earlier models, with consistent support throughout), oversized flex notches (which allow for smoother flex), and the Rad Pad (which consists of pre-curved panels at the top of the instep, geared toward a comfortable lace feel). There are color and size options for the Burton Ambush Boot.