Sirloin Cap vs Skirt — What's the Difference?
Quick Answer
Sirloin Cap (sirloin cap) and Skirt (skirt steak) are not the same cut: Sirloin Cap is sirloin primal (top sirloin cap (coulotte)); Skirt is plate primal (diaphragm (inside/outside skirt varies by spec)).
Canonical entities: Sirloin Cap · Skirt
Side-by-side
| sirloin cap | skirt | |
|---|---|---|
| Primal | sirloin | plate |
| Muscle / location | top sirloin cap (coulotte) | diaphragm (inside/outside skirt varies by spec) |
| Character | Triangular cap on the top sirloin; prized as picanha in Brazil. | Plate primal diaphragm muscle; very beefy, used for fajitas and grilling. |
Key differences
- Different primals: sirloin vs plate.
- Texture and slicing: compare fibrous, grain-heavy cuts vs more tender steak-style muscles based on each cut’s description.
- Retail naming diverges by country—always map through a canonical cut when translating menus or labels.
When to use each
Sirloin Cap
Pick Sirloin Cap when you want its specific marbling/texture profile: Triangular cap on the top sirloin; prized as picanha in Brazil.
Skirt
Pick Skirt when its primal/muscle traits fit the dish: Plate primal diaphragm muscle; very beefy, used for fajitas and grilling.
Sirloin Cap and Skirt are different canonical muscles/primals: Sirloin Cap is sirloin (top sirloin cap (coulotte)); Skirt is plate (diaphragm (inside/outside skirt varies by spec)).
Choose based on tenderness, marbling, grain direction, and how you plan to cook (sear vs braise vs slice thin).
Read the full guides: sirloin cap (what-is) · skirt (what-is) · sirloin cap hub · skirt hub