Vapor MFEATURES PRESSURE ABSORBING FIT (PAF) SYSTEM 2mm XS Grip2 rubber is used to wrap the heel cup in a minimal configuration, providing support, protection and friction while allowing maximum conformability. The DTS Active Rand is discontinuous at the Achilles, allowing for a more comfortable fit in this area but still providing dynamic forward pressure to focus power over the big toe. D2 RUBBER D2 is a fusion of two rubber compounds, M50 and M70,