First off, I love Zutano booties. They are warm and they stay on baby feet better than anything I have found. We've had a pair in 3,6 and 12 mo sizes for both of my children and they've all fit well. My youngest is very large and at 7 months is already ready for the 18 mo size, so I ordered a pair. Both the first pair I ordered and the replacement pair (after starting a return for the original pair as a defective product) have come with elastic that is stretched out and fall right off my child's feet. I don't know if these are factory seconds that somehow have gotten into circulation unmarked, or they're knockoffs with carefully forged tags, or if they're just having quality control problems. Perhaps that's why they're almost 1/2 price right now, but both sets of booties I've recently bought are definitely not up to the Zutano standards that I've received in the past, and the tags look legit and indicate they're from different batches. The elastic is so stretched out that there's no wrinkle in the back of the bootie. Attached image with standard 12 mo blue bootie for comparison and both pairs of defective green 18 month booties.