Caldera Spa covers meets or exceeds every ASTM (formerly American Society for Testing and Materials) safety standards for UL classification. This very futuristic cover that is compatible with our spa cover lifter system which provides easy and convenient accessibility to your hot tub. The durable streamlined cover protects against the weather and wear and tear of your hot tub cover The cover lifter system make it effortless to access your hot tub. BeyondNice has Caldera covers that are compatible with every model from 2000 to present. Caldera covers are made of marine-grade vinyl and come with a lock and key to provide security and safety.