Breather cover The outer cover fabric is skin-friendly and comfortable, and breathable. Memory foam has strong rebound ability. Topper inverted wool fabric Used to bond with HOOK & LOOP, the effect is remarkable, beautiful and easy to wash. Buttom strong HOOK & LOOP The strong HOOK & LOOP design fixes the topper and the buttom, with a composition around and in the middle, which is very strong and easy to disassemble. 2022 latest design mattress. Bottom mattress non-slip bottom Can be removed. And the non-slip bottom design increases the friction between the mattress and the placement position, and there is no problem with people turning over on it. HOOK & LOOP is divided into male and female sides, one side is a fine soft fiber the other side is harder like a small hair scratching thing. The bottom part is HOOK & LOOP hair grip. Inverted wool fabric instead of HOOK & LOOP fiber surface, beautiful and practical. The zipper design is convenient to take off the cover and easy to clean. The bottom foam is 4 inch Flex Support Base Foam, no gel. The top structure is 2" AeroFusion Memory Foam, 2" Flex Support Base Foam. Strong velcro Pouring wool fabric Zipper (for unloading) Memory foam Your doubts can be solved here. Q1:How is the comfort topper and support topper fixed? What is the HOOK & LOOP? A1:Topper and support topper are bonded by HOOK & LOOP around and in the middle. One side of the HOOK & LOOP is a small soft fiber and the other side is a stiff little hair-like grip, which creates a natural bond by increasing friction and is very strong. Hand wash is recommended to protect the stickiness of the HOOK & LOOP. Q2:Can the topper upper and lower layers be used directly and separately? For example, put it on the floor or other mattresses? If used separately, will it affect the adhesion of the HOOK & LOOP. A2:Comfortable topper can be used alone, it can be used as a perfect 4inch topper with a cover. But support bottom mattress is relatively hard, and there is Velcro on top, so it is not very convenient to use alone. But also can be used with other topper. Ultimately, it is recommended that the combination is used as a mattress. Q3: The cover HOOK & LOOP washed in the washing machine, the adhesion will not decline. A3: Not machine washable. Hand wash is recommended, the adhesion will be reduced, the cover of Comfortable topper can be machine washed. Q4: Is the softness medium hardness, or soft or hard. A4:Comfortable topper medium hardness, very comfortable, support bottom topper is harder, is to provide stable support. The combination of the two is particularly comfortable to use and can meet the needs of most people. Q5: Is it compressed and vacuum packed? Buyers can roll their own after use, put back into the box storage? A5: It is vacuum compressed packaging. The combination mattress is packed in two boxes. After opening, the foam can not be rolled and put back into the box. Q6:There is gel inside the foam, right? A6:The bottom foam structure is 4 inch Flex Support Base Foam, no gel. The top structure is 2" AeroFusion Memory Foam, 2" Flex Support Base Foam or 2" AeroFusion Memory Foam, no gel. Q7:The combination mattress is said to be 8inch, is it actually 8inch thick? A7:The combination mattress is made by combining comfortable topper and support bottom topper. Support bottom topper is 4inch thick and gray in color. comfortable topper is available in 2inch and 4inch. There are three colors to choose from: white, navy, and gray. From there, there are two combinations of mattress thicknesses:6inch and 8inch.