I have a few pairs -- both the "beach" and solid versions. I love them both. I live in them since last fall AFTER my Disney trip! I bought a pair as soon as we got home! I would say that the "beach" sandals are great in the warmer days sans socks. And the solid (no holes) will make your feet SWEAT in the winter. If you are wearing long pants, slip on a pair of ankle socks with them and no one will be the wiser. Yes, they are warm enough for Disney in December. I wore mine all winter long here in NC. I would recommend the blue colors or black with jeans. But I LOVE the hot pink and the bright orange!!
P.S. now Crocs makes flip flops!!! Out of the same materials! I am getting a pair or two for Mother's Day, I hope!!!