I've been riding all summer in a pair of cargo Dragging jeans which have Kevlar sew into them, and the two weeks we got that was very very hot  they was still cool to wear. I have not had a spill in mine but know a mate who has on gravel and the outer fabric ripped but the kevlar did its job and he had no marks or gravel rash on him, They very comfortable as well and hard wearing I wear my everyday and they still look new I even been clubbing in them and none knew they were bike trousers  be ideal for you in Mexico.
Rob
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