## Common ground
All options are knee and ankle supports made from different materials.
## Options at a glance
**3926.90 – Plastic material**
- **Defining trait:** Constructed primarily from rigid or semi-rigid plastic for structural support.
- **Typical examples:** Plastic hinged braces, rigid knee sleeves with metal stays.
- **Best fit when:** Need strong immobilization or joint stabilization (e.g., post-injury or post-surgery).
**4016.10 – Rubber**
- **Defining trait:** Made from elastic rubber for compression and flexibility.
- **Typical examples:** Rubber ankle wraps, compression sleeves with stretch.
- **Best fit when:** Requires moderate support with comfort and flexibility (e.g., mild sprains or athletic use).
**5903.20,6307.90 – Textile material**
- **Defining trait:** Made from woven or knitted fabric (e.g., spandex, nylon) for breathability and stretch.
- **Typical examples:** Elastic knee bands, soft ankle wraps, compression garments.
- **Best fit when:** Focus is on comfort, breathability, and light support (e.g., daily wear or mild strain).
## Key differences
| Feature | Plastic | Rubber | Textile |
|------------------|---------------|----------------|---------------------|
| Rigidity | High | Medium | Low |
| Compression | Low | Medium | High |
| Breathability | Low | Medium | High |
| Use case | Medical support | Athletic use | Daily/low-intensity |
## How to choose
- Is the support meant to limit joint movement? → 3926.90
- Does it rely on stretch and elasticity for compression? → 4016.10
- Is it soft, breathable, and worn daily? → 5903.20,6307.90
## Overlaps & pitfalls
A product may combine materials (e.g., textile with rubber inserts or plastic hinges), making classification ambiguous. If multiple traits apply, prioritize the **main structural material**. For example: a brace with a textile base and plastic hinges should be classified under 3926.90 if plastic is the key support element