Cover 4 (Quarters)

Cover 4 splits the deep field into four equal parts, with both safeties and corners each responsible for a deep quarter. It’s a matchup-based zone that often plays like man coverage, especially against vertical routes. Linebackers handle underneath zones and carry routes based on releases. Quarters is strong against deep shots but can be stressed by quick game and underneath spacing.

4 Lock

4 Lock is a variation of Cover 4 where the cornerbacks “lock” onto the #1 receiver in man coverage, while the safeties and linebackers play their typical Quarters rules on #2 and inside threats. This allows the defense to eliminate outside vertical routes while still maintaining zone integrity inside. It’s commonly used to handle strong outside receivers without sacrificing run support or interior matchups.

Palms (2-Read / Read 2)

Palms is a split-safety coverage that looks like Cover 2 pre-snap but plays like a read-based matchup coverage. The corner reads the #2 receiver—if #2 goes to the flat, the corner jumps it; if #2 goes vertical, the safety takes him and the corner stays on #1. This coverage is designed to take away quick game (especially out routes and bubbles) while still protecting against verticals. It’s very effective versus spread concepts but can be stressed by route combinations that manipulate the read.