Is a pocket spring mattress suitable for front sleepers?

Yes, provided you choose a firm enough option and the right comfort layer. Front sleepers need a flat, supportive surface; if the pelvis sinks in too far, it tilts and arches your lower back. A pocket spring core delivers that supportive feel, but go for firm or extra firm and combine it with Hybrid Foam or latex rather than memory foam. The Aero Pocket with a Hybrid Foam comfort layer is a good match.