A defensive front defines how the defensive line and box linebackers align across the offensive line before the snap. It dictates gap responsibilities, determines which offensive linemen are covered, creates linebacker bubbles, and sets run fits.
Before identifying individual front names, coaches look at four core principles that govern every front alignment.
A personnel grouping tells you who is on the field (such as a 4-3, 3-4, 4-2-5, or 3-3-5). A defensive front tells you where those players align relative to the offensive line.
A 4-2-5 defense can line up in an Over or Under front. A 3-4 defense can align in an Odd, Tite, or Bear front.
When a defensive lineman aligns directly on an offensive lineman, that blocker is covered. When no defender is on him, he is uncovered.
Uncovered offensive linemen create interior bubbles, giving second-level linebackers space to read and trigger downhill without being immediately engaged by down linemen.
Defenses declare a strength call based on offensive formation strength (tight end alignment, passing strength with multiple receivers, or running back offset).
The strength call determines which side receives the 3-technique or shaded nose, dividing interior responsibilities into A, B, C, and D gaps.
Defensive line techniques use a standard numbering system:
Explore each major front alignment below. Use the offensive presentation selector to view how each front aligns across spread and heavy sets.
The foundational four-down front. Sets the 3-technique defensive tackle on the outside shoulder of the strong-side guard (to the strength call) and the 1-technique nose tackle away from strength.
Key Advantage: Builds a reliable four-man pass rush while directing the strong-side inside linebacker cleanly into the strong A gap.
The inverse of Over. Sets the 3-technique defensive tackle away from the strength call on the weak guard, while the 1-technique nose tackle aligns to the strength side.
Key Advantage: Isolates the 3-technique one-on-one against the weak guard and frees the Will linebacker to attack cutbacks or flow unhindered.
A classic 3-4 front featuring a head-up nose tackle over the center (0-technique) and head-up defensive ends on both offensive tackles (4-technique).
Key Advantage: Provides two-gapping interior control while allowing outside linebackers (Jack and Sam) to apex over slot receivers or set the perimeter edge.
Pinches both defensive ends inside the offensive tackles into 4i-techniques on their inside shoulders, with a head-up nose on the center.
Key Advantage: Neutralizes inside zone, duo, and tight zone runs by spilling the ball horizontally toward scraping linebackers and overhang DBs.
Nick Saban and Kirby Smart's signature nickel package combining a 4i-0-4i interior with a walked-up Jack (J) on the weak edge and a Nickel DB (Ni) in space.
Key Advantage: Combines the run-stopping interior squeeze of Tite with a 4-man pass rush and 5 defensive backs in coverage against modern spread formations.
Covers the center and both offensive guards with down linemen (3-0-3 interior), completely eliminating interior combination blocks.
Key Advantage: Prevents offensive line double teams and climbing blocks, freeing linebackers to flow untouched to perimeter runs.
Dave Aranda's system-specific adjustment to Tite: shifts the frontside end into a 4i, shades the nose away from strength, and widens the backside end to a 3-technique.
Key Advantage: Closes three interior gaps with down linemen, freeing the frontside linebacker to aggressively attack the single remaining open A gap.
Vic Fangio's 3-3-5 package showing a five-man line of scrimmage (3 down linemen plus 2 walked-up edge linebackers) with a single stacked Mike linebacker.
Key Advantage: Presents a five-man rush threat against five-man offensive protections while maintaining a light two-high split-field coverage shell.
Compare defensive front alignments side-by-side to see how techniques, covered linemen, and open gaps shift between systems.
| Front Name | DL Techniques | Covered Linemen | Primary Box Structure | Strategic Profile |
|---|---|---|---|---|
| Over Front | 5 - 1 - 3 - 5 | Strong Guard (3-tech) & Weak Tackle (5-tech) | 7-man (4-3) or 6-man (4-2-5) | Builds a reliable four-man pass rush while directing the strong-side inside linebacker cleanly into the strong A gap. |
| Under Front | 5 - 3 - 1 - 5 | Weak Guard (3-tech) & Strong Tackle (5/9-tech) | 7-man (4-3) or 6-man (4-2-5) | Isolates the 3-technique one-on-one against the weak guard and frees the Will linebacker to attack cutbacks or flow unhindered. |
| Odd Front (Base 3-4) | 4 - 0 - 4 | Center & both Offensive Tackles | 7-man box in base 3-4 | Provides two-gapping interior control while allowing outside linebackers (Jack and Sam) to apex over slot receivers or set the perimeter edge. |
| Tite Front | 4i - 0 - 4i | Center (0) & inside shoulders of both Tackles (4i) | 6-man or 7-man box | Neutralizes inside zone, duo, and tight zone runs by spilling the ball horizontally toward scraping linebackers and overhang DBs. |
| Mint Front | 4i - 0 - 4i + Walked Jack | Center (0), both B gaps (4i), and weak C gap (Jack) | 6-man box (3-4 nickel / 3-3-5 structure) | Combines the run-stopping interior squeeze of Tite with a 4-man pass rush and 5 defensive backs in coverage against modern spread formations. |
| Bear Front (Double Eagle) | 5 - 3 - 0 - 3 - 5 | Center (0-tech) & both Guards (3-techs) | 8-man (46 defense) or 7-man (5-2) | Prevents offensive line double teams and climbing blocks, freeing linebackers to flow untouched to perimeter runs. |
| Eagle Front (Dave Aranda Version) | 3 - shade - 4i | Weak Guard (3-tech), Center (left shade), Strong Tackle (4i) | 6-man or 7-man box | Closes three interior gaps with down linemen, freeing the frontside linebacker to aggressively attack the single remaining open A gap. |
| Penny Front | 5-1 Surface (3-0-3 or 4i-0-4i + 2 Edges) | Center & both Guards (or Tackles) plus both edge perimeter gaps | 5-1 box (5 on LOS, 1 stacked Mike) | Presents a five-man rush threat against five-man offensive protections while maintaining a light two-high split-field coverage shell. |