The Pentwater delivers a very firm, supportive feel while still offering a touch of softness on top for added comfort. Its QuadCore® pocketed coil system with TrueEdge360™ support ensures a stable, edge-to-edge sleeping surface that won’t sag over time. High-density CertiPUR-US® foams create a comfortable cushioning layer that complements the firm support, giving you a mattress that’s both strong and pleasantly inviting.