It only says "Medium Duty" to denote that its not quite what you would use to strap your Jeep down onto the trailer.  But for tying gear down in the back of your Jeep, this thing is actually HEAVY DUTY!  The Poison Spyder Medium Duty Ratchet Strap can securely hold ice chests, tool bags and gear boxes inside your rig.  Features a beefy, more trouble-free ratcheting mechanism compared to our previous version (Light Duty), with heavier duty nylon webbing. 12' long with an embroidered Poison Spyder tag.