ATNICHES Dog Support Rear Lift Harness,Black Material:100% terylene + Sponge filler. Durable handle to assist dog. Ideal for dogs recovering from knee, hip or back injuries. S-fits dogs between 11-22LBS;M-fits dogs between 22-55LBS. L-fits dogs between 55-77LBS;XL-fits dogs between 77-99LBS.