The Nivia ZION-1 Spikes have a submlited mesh with pu sabarlon to keep your feet cool and comfortable with a lightweight tpu stitchless upper when the pace heats up. TPU sole plate with front and back spike pins for support. Submlited mesh with pu sabarlon upper durable comfort. To create a better, healthier environment for your feet to thrive in Two layers of high-density foam line the collar and mould to the athlete's foot to create a personalised heel fit,adding soft support and custom comfort. The Die-Cut soft NR EVA sockliner is laminated with polyester fabric for additional cushioning. The soft cushion NR EVA inner insole improves cushioning and comfort. Each boot has a Forpart rapid agility soleplate, supreme energy return, and 07 removable spike pins of appropriate length. The rubber sole on the back heel provides durability and traction on the track.