The Sentryse Hybrid Mattress in a Box is designed for everyday comfort with a cushioned Euro Top surface, a balanced medium feel and a responsive pocket spring support system. This hybrid mattress combines a breathable knit fabric cover, a 1.6-inch comfort foam layer with wave foam, foam padding and individually wrapped pocket springs to create a sleep surface that feels cushioned on top while staying supportive underneath. The foam layers help cushion the shoulders, hips and back, while the pocket springs respond separately to movement to help reduce motion transfer when sharing the bed. For added side stability, the mattress is built with thicker coils along the long sides, making it more stable when sitting or lying near the edge. The 10-inch model uses a 22 cm pocket spring height, while the 12-inch model uses a 28 cm pocket spring height for a thicker profile. This mattress ships compressed and rolled in a box for easier delivery and setup. Place it on a platform bed, box spring, slatted base or a clean, flat floor, then allow 24-72 hours for full expansion. Available in Twin, Full, Queen and King sizes. Spot clean only. Specifications: Type: Hybrid Foam and Pocket Spring Mattress Firmness Level: Medium Firm Mattress Top Type: Euro Top Bed Size Options: King, Queen, Full, Twin Thickness Options: 10 Inches, 12 Inches Material: Premium high-density foam, Individually wrapped pocket springs, Soft breathable knit fabric cover Setup: Mattress ships compressed in a box Allow 24-72 hours to fully expand after unboxing Compatibility: Fits most bed frames including box springs, platform frames, slatted bases, or even right on the floor. Care Instructions: Spot clean only. Do not machine wash or dry clean. Available Sizes & Weights 12" Mattress King: 76” x 80” x 12”, ~94 lbs 12" Mattress Queen: 60” x 80” x 12”, ~75 lbs 12" Mattress Full: 54” x 75” x 12”, ~64 lbs 12" Mattress Twin: 39” x 75” x 12”, ~46 lbs 10" Mattress King: 76” x 80” x 10”, ~89 lbs 10" Mattress Queen: 60” x 80” x 10”, ~70 lbs 10" Mattress Full: 54” x 75” x 10”, ~64 lbs 10" Mattress Twin: 39” x 75” x 10”, ~44 lbs