Not waterproof! I may have gotten the impression they were because they are sold as good footwear in a baby boutique here in rainforest Alaska, but they are not. On the other hand, when my toddler goes wading when the temp is in the 50s, her feet do stay warm in the fleece lining. I think the outer boot might be water resistant if just walking in a damp path. Definitely not what I thought I was purchasing, though.