I was able to get my hand inside to test this out, but adult use is not recommended as this is intended for children only, as it could cause injury. Using excessive force to remove a hand from the chamber poses a risk. If there is a problem getting a hand out it is advised to deflate first. The chamber cushions the wrists and hands of my children inside the pillow. This also comes with a small patch in case of puncture. The valves are easy to fasten and can be opened and released for deflating. This is made of 12-qauge vinyl with the logo on the top part of the Sock'em Boppers.