They have a good elasticity and are built very solid, which are great for keeping your boat sturdy if you use it on a river channel that the water levels rise and fall. Seems to be good protection for the case, also. These water shoes are awesome. But these shoes seems like such low quality for the price tag. Los utilizo para mis actividades diarias, no hago ninguna clase de deporte o ejercicio. Why should the consumer invest in bluetooth headphones only to constantly resort back to his/her phone to adjust something as simple as the volume? To connect them to my phone was very easy. 6 days later it is now tearing at the hinge point that joins the body to the lid. The packaging was also notably "cheaper" with this new set as well. Awesome replacement set and it was worth the gamble!