A round-neck t-shirt typically has the following specifications:

1. Fabric: Cotton, polyester, or a blend (cotton-polyester).
2. Neckline: Rounded, sitting at the base of the neck.
3. Fit: Available in regular, slim, or oversized fits.
4. Sleeves: Short sleeves, typically hemmed.
5. Length: Typically falls around the waist or hips.
6. Stitching: Single / Double-stitched hems for durability.
7. Color: Available in various solid colors or patterns.
8. Size Range: S to XXL (or more).
9. Print/Design: It can feature graphic prints and logos or be plain.

This style is versatile for casual wear and easy to layer.