Our guitar amp and speaker cab covers are MADE IN USA by Americans (unlike amp manufacturer covers made essentially by slave labor in China). They are constructed with high quality 600 denier PVC-backed Polyester (a durable, canvas-like material on the outside and Vinyl on the inside, similar to that which is used to produce many higher end outdoor grill covers, duffle bags and suitcases), which renders them completely dust and water proof, as well as extremely resistant to abrasion... Protecting your expensive amp or speaker cab from unsightly bumps, scrapes and scuffs. This material stands up to direct sunlight and constant water much better than Nylon and ordinary Vinyl... Twice the quality of amp manufacturer covers!