I've been using this pants since 2006.  As a guy, I feel like I really need the elastic waste band to keep my pants up.  The fly is also super crucial for me.  Plenty of pockets to use also.  Only knock is the incredibly long pants and they are very baggy.  I ended up getting them tailored to fit better.  I'm 5'10" 165 lbs and order a medium.  I'm not sure if small would have fit me either.