I ordered 4 of these teen size hop balls (2 yellow and 2 green) for my child's 3rd grade Field Day. After inflation, one of the green balls was considerably smaller- more appropriate for someone under 8. I placed a second order for a green ball, and this time it was the larger size. I had 120 3rd grade students (and a couple of teachers!) rotating through my game station in groups of twenty. The kids had a blast and relay raced on them outside for over an hour non-stop and the balls all held up amazingly well. Several adults asked where I got them and commented that this would make a really neat game for some of their church outdoor activities. So overall, sizing might be slightly inconsistent, but these are a very good quality hop ball.

Got these for my growing boys (5 & 7) who outgrew their toddler hopper balls. They are AWESOME! There is also another one that size up, and I can even use it with them. These are fun for a rainy day when you're kids need to burn some energy. We will often do hopper races across our family room. The hand pump that comes with it is also a great addition as I didn't need to run out and buy an additional item for it.

Bought this for my Grandson's 4th birthday. He LOVE'S it!!! It takes some practice and assistance for him to be able to mount it properly, (he has to back up to it) and bounce on it properly. He loves trying however. I believe as he gets a little taller, it will be a little easier for him. (You can adjust how much air it has in it, and we may still have it inflated a little big for him) He also just loves laying and rolling around on it. I also bought an adult size, but, we haven't taken that one out of the package yet. I will be ordering again, in the next few weeks, because he has cousins and friends coming up with birthdays, and I know they will love it as well. GREAT PRICE! VERY well made! It was shipped promptly.

I bought a total of 8 of these as Christmas gifts and they were the talk of the family. You have never seen folks from age 3 to 42 enjoying themselves so much. My great-granddaughter stated "grandma, you pick the best gifts". I can hardly wait for warm weather so that we can all get together in a park and BOUNCE. They are strong, sized for everyone to get the most out of them, colorful and most of all... FUN.

I had great hopes for this, and indeed my 3 and 4 year old grandkids were excited and did find ways to play with them, but their legs were too short to use them as they are used in the video.