Removable Liner: This boot comes with a removable liner. Removable liners have the advantage of being easier to dry than non removable liners, and the disadvantage of usually being a little larger than a non removable linered boot of the same size.
Backstay: The back of this boot is reinforced for strength and stiffness. It gives you the support you need for any ability level.
Integrated Heel Counter: A fancy name for a piece of plastic in the heel that gives extra support.
Low Profile Outsole: This boot allows the foot to sit closer to the binding and board for better feel and control of the board. There is still some shock absorption in there, so its still comfortable.
PVC/EVA shell/tongue materials: Scientific blend (PVC and EVA are both abbreviations of longer chemical names) offers more durability and comfort than other, uh, less scientific materials.
PVC Upper: The upper of this boot is a flexible PVC plastic, that feels about like a stiff leather. This material is highly waterproof and resists abuse well.
Speed Lace System: Two pulls on the laces, and cinch the lock into place, and you're ready to ride. Quick adjustment means more time on the slopes!
Thermo Liner: A removable liner that has the ability to quickly mold to the shape of the rider's feet and ankles. Just with body heat and pressure (wearing them), the liner starts to take shape for a near-custom fit.