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Mesh Spot out of Shotgun Wing Slot Offset is a classic mesh concept married with a spot route on the backside. On the play side, two receivers cross underneath at the same depth to create natural rub traffic against man defenders while a shallow drag sits underneath as an outlet. The backside runs a corner route up top with a flat and a hitch underneath to hold zone defenders low, and the outlet route in the backfield releases into the flat as a checkdown. This is primarily a man beater thanks to the mesh traffic, but the spot concept on the back side also gives it legitimate answers against Cover 3 zone drops. Your first read is the mesh crossers underneath, working to the corner route on the back side if the shallow routes are taken away.
Pre-snap, check linebacker depth and spacing since tight underneath linebackers signal man coverage or a blitz look that mesh traffic will exploit. Watch for a single high safety shell, which usually means Cover 1 or Cover 3, both of which mesh crossers and the corner route combo can attack. Post-snap, key any user-controlled defender sitting in the mesh area (a lurk defender), since a smart human user can sit in the crossing lanes and jump the shallow routes. If the defense shows two deep safeties with underneath zone drops, expect the mesh crossers to get squeezed and look to the corner route or checkdown instead. Disciplined zone defenses that keep linebackers deep in their drops and avoid crashing on mesh traffic will limit the effectiveness of this concept, forcing you to rely on the backside spot routes.
Use this on early downs or third and short to medium since the mesh crossers create easy separation and YAC opportunities against man coverage.
Identify the coverage shell pre-snap by checking safety depth, if you see two deep safeties expect more zone drops and prioritize the corner route on the back side over the mesh.
Hot route the shallow drag into a deeper crosser if you diagnose a heavy blitz look, this gives your quarterback a faster outlet against pressure.
Pair this call with Double Cross or Double Stick from the same set to keep the defense guessing between mesh traffic and stick concepts without changing personnel.
Against aggressive man coverage defenses, trust the natural rub created by the crossing routes and get the ball out on time to the first open crosser.