I own two pair both are Chippy's. The first is a pull on, the classic style with the leather lower and cordura upper. They are reasonably cool and very light. My second pair , is the Lace Up , waterproof kind, they have a Leather Lower and a leather /cordura upper. Much warmer and heavier then the others. I like them both for different reasons, and I wear both year round . Besides snakes here in Tejas, there are many thorny bushes and cactus, can't tell you how many times my calfskin have been saved by these boots. In any case, this may or may not have helped much, but it's what I have expierenced. Tu Compadres, Sutty