Not all hot tub covers are created equally.  There are standards that must be met for a spa cover to be considered a "safety cover."  These standards were created by ASTM International so that consumers would know if they were indeed purchasing a real safety cover, and not a cheaply made spa cover with no real safety specifications. 

ASTM F1346-91 specifies the requirements for all manual and automatic safety covers, for pools and hot tubs.  SpaMate spa covers meet the requirements for a manual safety cover, and are individually tagged to relay this specification to our customers.  We care about the safety of your customers and their families and are proud to manufacture only spa covers that meet these specifications.