Flex Rating: 8 out of 10
Flex Rating: The flex rating of a boot refers to how stiff the boot is, the higher the relative rating the stiffer the boot. Some boots will list 4 of 5, others may list 8 of 10; two such boots should have similar flex. In general more beginner rider wants a lower flex and more advanced rider a higher flex, but this is not always the case as some beginner riders like more support and some advanced riders like more give.
Tongue Pull: A loop of fabric at the top of the tongue helps in putting on and removing the boots. Pull it forward and to the side and your foot should slide right in.
Lace Lock: A mini friction device replaces a couple eyelets of this boot to make sure the laces don't slide around when tying up or when riding.
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.
Dual Density Rubber Sole: One type or rubber to add stiffness to the sole, a softer rubber to increase grip.
Integrated Heel Counter: A fancy name for a piece of plastic in the heel that gives extra support.
JB Liner: This liner is molded and stitched for shock absorption and increased insulation. It also features an articulated ankle and heel for better function. The lace tabs are reinforced with long bars stitched into the liner to eliminate pull outs.
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.
Steel Hardware: The eyelets and other critical parts of the lacing system are made of steel for increased wear.