The fabric of the upper is itself waterproof but the seam where it joins the waterproof rubber bottom is not waterproof. I will be returning them for another model by the same brand that is "waterproof seam sealed". I should have read more carefully. It is a well thought out design and seems extremely durable. The removable liner is convenient for sizing to the child's foot and for drying out wet boots. It does not come out by accident when the kid just slips their foot in and out. The sinch on the upper collar makes it easy to put the pant leg over or under. We had a second problem where they're too narrow on my child. We do occasionally buy wides for her which will be the next pair we get from Kamik. They work with thin socks which is fine since they seem so warm on their own. But with the water problem and the fit problem it is just not worth the hassle. Overall it seems like a good product if your puddles are not deeper than 2". The "waterproof" upper will shed snow just fine, but not standing in super deep puddles. Try telling a 2 yo that!