The 4 ft Sack is great for kids and adults, especially if you want to them to have more space. It is bigger and far more comfortable than the common bean bag chairs currently out in the market. One more thing that differentiates our chairs is the quality of our inner foams. We use polyurethane foam which is the exact same type of foam found in high end couches, so no need to worry about pesky styrofoam pellets popping out every now and then and eventually making a mess! Furthermore, polyurethane foam also keeps the shape of our chairs consistent throughout the years. Don't expect to be throwing your Comfy Sack anytime soon because it fell flat like the usual bean bag chairs. It will certainly hold up, as this has already been proven by many customers who has owned our products for long years. One of the features that most parents truly appreciate about Comfy Sacks is the break-away zipper which keeps children from accessing the inside of the chair and possibly swallowing any foam. Once the bag is all closed up, all needs to be done is to simply twist the zipper off to lock it in place. Be at ease when your kids are being playful around the chair, as there won't be able to get through that locked zipper. This safety precaution is unique to Comfy Sacks as our company values the well-being of the families who order our product.