The back-protector-concept is made of VPD (visco-elastic polymer dough) that gives a high level of protection as wellas a unique capability to adapt its shape to your body.
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POCito VPD Air Vest + TRAX POC Edition | ISPO 2019 News - YouTube
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Amazon.com : POC, POCito VPD Air Vest, Youth Mountain Biking Armor for Kids, Fluorescent Orange, Small : Sports & Outdoors
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