The fabrics have a thermal coating on the back that help to reflect the sun's harmful rays and reduce the heat on hot sunny days. (madetomeasureblinds-uk.com)
This can be especially useful for hot sunny days or for taking your kids to the beach. (geekwrapped.com)
It was a gorgeous hot sunny day in the 31 ° C or 87 ° F range. (tacogirl.com)