I love these. I am a huge fan of the flip flops model, and now they created something I can use off season. The boot is not insulated, but it has a nice lining that keeps my (super cold) feet warm with only one pair of socks. They are not waterproof, but I am going to spray them with protectant. I take a size 8 in the flip flops, so I ordered the same size in the boots. They fit perfectly. They are so comfortable. I live in Wisconsin and plan on wearing them spring, fall, and winter.