These onesies have a zipper on the back. Over the zipper is a piece of fabric that closes with a button. See detail photo. This onesie prevents undressing and smearing, but it is not an anti-tear suit. If your child or client tears clothes, this onesie is not suitable. There are buttons on the front. These cannot be opened. The onesie can be worn over a romper/body. Suitable for summer and spring.