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They don't say they're waterproof, I wouldn't waterproof yours as the chemicals would dehydrate the leather. Because water is polar and oil is non-polar, whenever you oil (condition - upkeep) your boots, it essentially kinda waterproofs the leather. I've stepped in many puddles and have never had wet socks.
Definitely get a mattress topper. Here's a link to the one I bought, I would pay $200 for how comfortable it is.
Let me know if you have any other questions!
I got one from Amazon about a year ago for my mattress at home. It's memory foam and Twin XL and was only about $60.
I bought this one on Amazon, and it worked good. You aren't allowed to have it in dorms but if you have sheets over it you can't see it.
bout 2 inches of decent foam is really all one needs for a bed.