Purr & Simple is an all natural and fragrance free cat litter. It is 100% biodegradable and comes from annually renewable resources. Mother Nature provided Purr & Simple with an incredibly effective neutralising ingredient - the Nutshell! Our all-natural cat litter maintains a proprietary blend of fibrous material from tree-nut crops. This revolutionary cat litter is annually renewable - made from sustainable resources that can be restored by nature within one year.