We use straw in the nests, wood shavings on the coop floor (vinyl) and sand in the run. Also have a pdz covered poop board and that keeps the coop quite clean and eliminates most of the odor. In winter when it's super cold we toss a straw flake into the run so the chooks have something to mess with and after it's spread all over, the bonus is giving their feet a rest from the cold sand.