These cot bumpers are made with a soft Organic Cotton Twill cloth. It is filled with a thick protective layer of virgin polyester pad. When children start moving around, they tend to hit their heads, or get their hands and feet entangled between the slats. These bumpers are designed to protect them from these risks. Designed as a universal size bumper that fits all standard crib sizes. The redesigned attachment straps on the back, can be wrapped around the bars, and then stuck back onto the fabric. This also makes the bumper secure from coming loose and falling on the baby.