The mesh design of these elbow and knee pads means they are breathable, absorb moisture and provide your crawling baby with comfort, grip and protection from harsh surfaces and surface friction. (mombible.com)
Your baby's soft knees are protected from harsh surfaces, bugs, and sun rays. (newbornbabyzone.com)
The wheel (rolls on 3 wheels) is made of hard rubber with suspension system which helps to prevent the shock from bumps & it is very easy to move on every kind of harsh surface like sand, snow, stone, grass area etc.. (bestbabydollstrollerreviews.com)