【MEDIUM FIRM MATTRESS】Spring support and high-density foam cushioning creates a medium-firm sleeping feel. Enjoy pure comfort without splashing the cash with the BedStory Single Mattress. You can’t go wrong with this single mattress. 【SUPPORTIVE MATTRESS】The mattress is designed with 2.15mm Bonnell spring providing perfect balance support of the head, neck, shoulder, waist, hip, legs, and feet. Long last elasticity, won’t collapse easily. 【BREATHABLE MATTRESS】This single mattress features breathable skin-friendly knitting fabric that automatically increases air circulation, avoids sweating when waking up. 【ERGONOMIC MATTRESS】Made with ergonomic design, this great-value single mattress is effectively protected kids' spine and back. A firm or medium-firm mattress will ensure a kid gets the necessary spinal support during sleep, also perfect for teens, couples, single people. 【MATTRESS-IN-A-BOX】Our mattresses are compressed, rolled, and shipped in a box conveniently to your door for easy set up. Recovery of 72 hours is recommended for your new mattress to get to its original shape.