i have been wearing these pant everyday for about eight years now, they have become my favorite for all seasons and i have them in four colors(bark,green,black and dark brown).They are constructed of a firehose-like fabric and They usually last me about three years before the crotch develops holes but that is with everyday heavy wear and the crotch rips provide extra ventilation during the summer months but the holes eventually become too big.  Great work/everyday durable trouser and i recommend them to anyone that asks about them.  Also, the prime price is great as i would have to pay $55 at my local clothing store for the exact same pants.