Great product. We used it at our school's field day as a Sumo Collusion Battle. The high school kids LOVED running into each other and bouncing away hitting the ground. The material is thick and durable. We had no problems inflating them with an air pump made for inflatable mattresses. After about 30 minutes of use, you had to add more air because some of the air seeped out. It only took about 2 to 3 mins to top off the air. Even though kids got knocked around no one got injured. There must be supervision to always remind students to make contact with the belly of the bubble and not to lead with their heads.
Overall, we loved the product and plan on using them for all of the outside play day events we have at the school.