1, Heavy duty and light weight cover for longest service time in harsh conditions 2, Highly protective top panel made of composite materials--tyvek with polypropylene, 100% waterproof and breathable 3,  Sides 160 gsm 4 layers polypropylene soft and breathable 4, Vacuum packing for saving volume and delivery cost. 5, As an experienced travel trailer manufacturer, OEM, ODM and custom-made covers are available.