## Common ground
All options refer to nipple covers, which are wearable items used to cover and protect the nipples.
## Options at a glance
**3926.90 – Plastic material**
- **Defining trait:** Made primarily from rigid or semi-rigid plastic, often molded into shape.
- **Typical examples:** Disposable plastic nipple shields, reusable hard plastic covers.
- **Best fit when:** The product is stiff, non-stretchy, and designed for protection or medical use (e.g., breastfeeding aids).
**4016.99 – Rubber material**
- **Defining trait:** Made from natural or synthetic rubber, offering flexibility and softness.
- **Typical examples:** Soft rubber nipple shields, flexible breast covers.
- **Best fit when:** The product is pliable, stretchy, and used for comfort or sensitivity reduction.
**6307.90 – Textile material**
- **Defining trait:** Made from fabric (e.g., cotton, polyester), often soft, breathable, and washable.
- **Typical examples:** Soft fabric nipple covers, reusable cloth shields.
- **Best fit when:** The product is made of woven or knitted fabric, used for daily wear or comfort without irritation.
## Key differences
| Feature | Plastic (3926.90) | Rubber (4016.99) | Textile (6307.90) |
|------------------|-------------------|------------------|-------------------|
| Material feel | Rigid, firm | Flexible, soft | Soft, breathable |
| Stretchability | Low | High | Medium to high |
| Common use | Medical, protection | Comfort, sensitivity | Daily wear, comfort |
## How to choose
- Is the cover stiff or molded? → 3926.90
- Is it made of soft, stretchy rubber? → 4016.99
- Is it made of fabric like cotton or polyester? → 6307.90
## Overlaps & pitfalls
A product may combine materials (e.g., textile with rubber lining), but the primary material determines classification. If unsure, prioritize the dominant material by weight or function. No option is clearly prioritized—choose based on the **main material** used in construction