Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

I have been buying Hi-Tec for years. When I found the Altitude IV I fell in love instantly. This shoe fits great, has little break in time and still holds its sturdiness as it ages. Well recomended.
Positive

This product arrived on time and in excellent condition. These boots have a good arch and seem sturdy. They do look a little cheaper than I anticipated. The tread is great. Size runs true.
Positive

leaks after leaks after leaks. i have patched them with super glue and bike patches and they just dont seem to stop comming. i am tired of patching them. dont ever buy a air mattress. just fork out the cash for a good mattress.

Negative