The Serta iSeries NXG 1500 Hybrid Firm Mattress delivers immediate cooling, instant pressure relief, and firm support for deeper sleep. Features high-density NXG Memory Foam for contouring pressure relief with firm foundation. CoolFeel Cover provides cool-to-touch surface while Carbon Fiber Memory Foam draws heat away from body. 5-zone coil system with alternating firm and plush areas supports back and body curves. BestEdge Support provides edge-to-edge stability. Great for stomach and back sleepers. Available in Twin XL, Full, Queen, King, and Cal King sizes.

NXG Memory Foam Technology

The high-density NXG Memory Foam provides contouring pressure relief while maintaining firm support foundation. This innovative premium foam responds to body weight without excessive sinking, delivering pressure relief at key contact points while keeping spine properly aligned on firm surface ideal for stomach and back sleeping.

5-Zone Coil System

The 5-zone hybrid coil system features alternating firm and plush areas that prevent lower back arching for stomach sleepers and maintain spinal alignment for back sleepers. Firmer coils beneath lumbar region provide strong support while coils adjust to body curves. BestEdge Support maintains stability from edge to edge, maximizing sleeping surface and preventing roll-off.

The CoolFeel Cover provides cool-to-touch surface that delivers immediate cooling sensation when you lie down, helping you fall asleep faster. The fabric dissipates body heat for comfortable initial contact with mattress surface.

The Carbon Fiber Memory Foam layer actively draws heat away from body throughout the night. Carbon fiber's thermal conductivity pulls warmth from sleep surface and disperses it, maintaining comfortable temperature. The firm surface prevents deep sinking that can trap heat, working with cooling layers for all-night comfort.

Use mattress protector to guard against stains. Rotate head-to-foot every three to six months for even wear. Avoid jumping or standing on mattress. Do not fold or bend. Allow new mattress to air out for 24-48 hours after unboxing.

Why firm for stomach sleepers?

Firm support prevents lower back arching that occurs when stomach sleepers sink too deeply into soft mattress. The firm foundation keeps hips from dropping below shoulders, maintaining neutral spine alignment. This prevents morning back pain and supports proper sleeping posture for stomach sleepers.

How does 1500 differ from 3500?

Both offer firm support with NXG Memory Foam and 5-zone coils. The 1500 provides entry-level firm comfort at accessible price while 3500 may have enhanced foam layers. Both suit stomach and back sleepers needing firm support with same core technologies and cooling features.

Does firm mean uncomfortable?

No, the NXG Memory Foam provides pressure relief on firm foundation. Firm doesn't mean hard; it means supportive surface that prevents excessive sinking. The memory foam layers contour to body while coil system maintains firm support, creating comfortable firm feel that's supportive not rigid.

Will I feel partner movement?

The mattress minimizes motion transfer despite firm feel. Memory foam layers absorb movement while individually wrapped coils move independently. When partner shifts or gets up, you experience less disturbance compared to traditional innerspring mattresses, even with firmer support level.