Diamond Mattress's Black Diamond Collection, provides a supportive, long lasting, comforting mattress with cooling technology. Feel the support of Individually Wrapped Coils as they conform to your shape while it keeps you resting soundly without the feel of partner movement. Pressure relief is achieved with CoolTouch GEL™ Memory Foam designed to breath, keeping you comfortable throughout the night. The CoolTEK™ cover is highly breathable & wicks away moisture keeping you dry. This Medium Tight Top mattress works well for a side, back or Stomach sleeper.