SRC Impact Zone begins at the heel and extends to under the midfoot. SRC stands for Super Rebound Compound and the material is designed to provide shock attenuation to set the foot up for a smooth transition.
Arch-Lock is utilized at the medial midfoot and adds additional security to the upper for a snug fit.
HydraMAX Collar Lining cups the heel and
XT-900 is primarily utilized in the heel and is a carbon rubber material that increases traction without sacrificing durability.