1.Back cushion is ergonomically designed to fit the streamline of your spine curve, contoured design effectively helps realign your back and spine, it can sufficiently alleviate the pain and fatigue of lumbar and vertebra area<br> -Prevents muscle fatigue and tightness in your back<br> -Promotes good posture and proper spine alignment<br> -Relieves pressure points and increases blood flow,lets you sit comfortably<br> <br> 2.High-density and high resilience memory foam gives you a perfect balance between firmness and softness, contour of your lower back, disperse your pressure, alleviate fatigue from your spine<br> -It remain uniform in density<br> -Conforms to your individual shape,relieves pressure points,maintain support and comfort <br> -Water and heat may destroy memory foam structure, so please don’t wash it, dry it nor expose inner memory foam in the hot sun <br> <br> 3.The adjustable elastic strap fits any chair and keep the cushion in the perfect position,of course,the back cushion can also be used without the straps when sitting on couches or somewhere else,by putting it behind you and lean against it <br> <br> 4.The zippered cover is removable,and can be gently washed by hand or by machine<br> <br> 5.Fits all kinds of chairs,It's suitable for most of office chair, car seat, wheelchair, gaming chair, recliner,home chair or seat on a bus, airplane or train, and perfect for office workers, drivers, teachers, students, people in a wheelchair, pregnant women etc.<br> <br> 6.Use it anywhere to make sure you sit comfortly<br> <br> <br> <br> Product parameters: <br> Product Dimensions: 17.71 x 15.72 x 4.3 inches<br> Item Weight: 1.46 lb<br> Color: Black<br>