Technical Principle 3: More Predictable Cushioning and Surface Friction

For children, two safety issues are especially important:

1. The field should not feel too hard when children fall or land.
2. The surface should not become locally slippery or overly abrasive.

Traditional filled turf can perform well when infill is evenly distributed. However, in school environments, infill distribution may change quickly in high-use areas. Entrances, playground equipment areas, goal mouths, and running paths may experience particle migration, compaction, or loss. This can create local hard spots or uneven friction.

Vivaturf non-infill turf uses a more integrated structural approach.

4.1 Dual-Layer Cushioning

Vivaturf non-infill systems may use a combination of:

• High-density straight and curled yarns
• Soft-touch, child-friendly surface fibers
• Reinforced backing
• Optional elastic or closed-cell shockpad layers

The yarn layer provides the first stage of surface contact and comfort. Curled fibers help reduce direct surface harshness and improve resilience. The backing and shockpad system then provide a second stage of impact absorption.

This structure helps create more predictable cushioning across the field, rather than relying on loose particles that may shift over time.

For school fields, typical performance targets may include:

• Shock absorption: commonly designed within a controlled range suitable for school activity and sports use
• Vertical deformation: controlled to avoid both excessive hardness and excessive sinking
• Surface flatness: maintained through stable installation and base preparation
• Friction stability: designed to reduce sudden slipping or over-gripping

For kindergarten applications, a softer and more skin-friendly surface specification may be preferred. For primary and secondary school sports fields, a more balanced design is usually needed to support running, football, general PE classes, and high-frequency activity.

4.2 Stable Friction for Running, Stopping, and Turning

Children often run, stop, turn, and fall unexpectedly. A safe campus surface should offer enough grip to reduce slipping, but not so much friction that sudden stopping increases ankle stress.

A non-infill system can help keep friction more consistent because the surface is not controlled by a moving particle layer. Vivaturf uses yarn shape, surface texture, fiber resilience, and density control to help maintain a stable friction field.

This makes the surface more suitable for daily PE classes, playground activity, campus football, and multi-purpose activity zones.