Is this bigger than the 4-6x size?

Yes, Sorry if Jennifer didn't find the extra large 6-8x size that we are speaking of here. My son is now 8 and 65+ lbs. (fit). And he still wears it. It is highly adjustable (the vest) and I promise I am NOT an alien and I am wearing one of the gloves holding my phone to get this straightened out. The only prob. I have its the fingers are a little short, but then again I have longer fingers.

I am so confused. what does this do? it can't just be a vest and gloves for $30! what happens when you get a creature power disc to add to it?

Yes it is just a vest and gloves, but there are 2 pockets for the creature power discs, one on the chest and one on a glove. For kids that like dressing up and pretend play it is a great gift. My son loves it, he is 7 years old. Wild Kratts Live came to our city and at the show a third of the kids had their creature power suits on. The box comes with 3 discs and if you buy some of the character packs they also comes with other discs.

The description states it includes a "power disc holder" - is there one included and is it the same thing as in the wild kratts adventure set?

No! We just received the adventure set which includes the pod or container for disks. This creature power suit does not include the pod, just little slots in the suit to put a disk.