KneePro Ultra Flex IIIKNEEPRO 'Ultra Flex III' Tough & Durable Plastic Shell Kneepad with EVA foam inner. Features: Incredibly tough flexible outer shell is chemical resistant withstands extreme cold and heat. Non Marking grip strip grips on most surfaces. Extended face greatly increases comfort, especially for extended kneeling. Hinged with a metal rivet so it moves like your knee and stays in place! 5 8 inch closed cell inner foam pad offers the ultimate in comfort will