12 Inch King Size Mattress, Hybrid King Mattress in a Box

12 Inch King Mattress, Hybrid Mattress 3 Layers Premium Foam with Pocket Springs, Medium Firm Feel, Pocket Spring for Motion Isolation & Targeted Support Mattress features: Cooling and motion isolation: The coil system is 20 times more breathable, keeping you comfortably cool. The sleeping mattress isolates motion for an ideal undisturbed sleep even if your partner moves at night. The comfortable and Supportive layer of premium foam and pocket springs design gives you a medium firm feeling, keeping the body properly aligned, pressure relief & heat dissipation. Size information: Twin: 39"W x75" L x 12"H Twin XL: 39"W x80" L x 12"H Full: 54"W x 75"L x 12"H Queen: 60"W x 80"L x 12"H How to set up the mattress: - Step 1: Open the box. - Step 2: Keeping the mattress wrapped, slide it onto the surface of your bed frame. - Step 3: Proceed with caution! Using the special unpacker inside the mattress, carefully cut the plastic, being careful not to cut into the foam of your mattress. Please keep your distance and enough room for the mattress when opening, as it may have a risk of smacking people when expanding. - Step 4: Unroll your mattress. - Step 5: Allow 48-72 hours for the mattress to regain its full shape. Friendly reminders: 1. Whether it is a foam mattress or hybrid mattress, your body needs up to 4 weeks to get used to a new mattress. 2. Due to the different weight, height, and sleep positions of different people, the firmness and feeling may be different.  3. Rotate the mattress regularly to extend the durability of the mattress.