Underside of Gecko (IMAGE) University of California - Riverside Caption On the underside of a gecko's toes are 'setae,' millions of very fine hair-like structures, which provide increased surface area and close contact between the foot and the surface on which it rests. Credit Emily Kane, UC Riverside. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.