The first time I was introduced with the gecko, I was in Thailand. Geckos climb everywhere, even on the ceiling. This is because of their feet and hands. American scientists from the American Deence Advanced Research Projects Agency studied the legs of these animals en discovered that they could make a fabric for humans to be a gecko. That is why they designed the Geckskin. The fabric they designed can carry 300kg, while hanging on glass. If you want to know how the technique works, check the video below:
Read more about the Geckskin on https://geckskin.umass.edu/
Here you see a person walking against a glass wall with the Geckskin.