Poc joint vpd system elbowpoc's joint vpd system elbow is a 2 ply, stretchy elbow protector. It features a highly proficient ventilation system for optimal moisture management and comfort. The outer fabric is made of high resolve polyamide yarns to ensure low friction and high abrasion resistance. Vpd is the ultimate material for mtb as it wraps around the body shape when warm for greater freedom of movement on the bike. Upon impact, the vpd technology hardens to minimise injury.featureslow friction, polyamide constructionextremely flexible and light vpd elbow paden 1621 1 certified shock absorptionventilation system constructed within each layertechnologiesvpd visco elastic polymer dough poc's work together with specialists on spinal injuries, riders of all kinds and experts in material and construction have resulted in body armour that will give you both a high level of comfort and safety.the vpd visco elastic polymer dough range offers extreme impact absorption, which has given poc a completely new approach to developing body armour. Vpd is highly impact absorbent, comfortable and adapts to create an individual fit and due to its high level of protection and the ability to transition from soft to hard during impact, they don't have to choose between safety and flexibility.many back protectors are lightweight, but may not be optimal for shock absorption. Some can take one impact with good shock absorption, but a second impact to the protector will transfer a much higher amount of energy to the user, the third an even greater amount and so on. Vpd material retains the same high absorption level, and that is an important property for poc since they believe that a protector will have several impacts during one fall, and during its lifetime.buy poc protection from chain reaction cycles, the world's largest online bike store.