When these boots arrived, I quickly tried them on. As suggested by many reviewers, I purchased a size larger than I usually wear. They were so comfortable without needing to be worn in that I had wanted to come to Amazon and give them a 5 star review. However, I specifically bought these because they were described as waterproof and I wanted to test that out before reviewing. I finally put them to the ultimate test by hiking in the snow for 2 hours recently. The snow was often deep enough to cover my boots but not once did any of it melt into my boots. My socks were bone dry... okay maybe not *bone* dry as I had a bit of unnoticeable sweat but they performed exactly as expected. Love LOVE these boots!