This Spine VPD Hydration Pack does it all, combining the superior VPD back protector with a hydration pack and extra compartments for tubes, energy bars, rain jacket, mobile phone, keys and repair kit. VPD (Visco-elastic-polymer-dough) has amazing energy- absorbing properties. The VPD material is extremely agile and soft but as energy or force is applied, the material stiffens and becomes rock hard. |
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