Specially Treated Nylon Blocks Out 99-Percent+ Of Sun's Harmful UV Rays And Protects Against All Natural Elements All Seams Electronically Heat Sealed To Be Completely Waterproof Easy To Install, Has Elastic Bottom Allows For Snug Fit On All Shape Motorcycles and Sewn In Elastic Bungees For Universal Mounting Packed In Handy Carry All Reusable Storage Bag When Folded, It's Small Enough To Fit In Almost Any Storage Compartment