This is an under the legs transport harness size large that can be used with a stand up lift such as the Invacare GSH350 Stand Up and Go Lift. The transport sling harness is used when the patient can not stand successfully well enough to utilize the stand up sling with a stand up lift. With the transport sling the patient can be moved in a seated position while utilizing a stand up lift for patient transport.I purchased the sling new from SpinLife.com and you can find further details there, My cost was $149.00. The sling has never been used.