These are overall beautiful and good quality curtains, however they are not true blackout curtains. Light dampening would more more appropriate to describe them. I bought these in the 108" length for my daughter's new big girl room which has a big East facing bay window. They do a decent job of helping to dampen the bright morning sun but I will end up sewing or pinning in an extra layer of fabric between the curtain and the liner to help keep out more light. They do a great job of cutting down the heat from the morning sun that builds up in that bedroom so the 'Thermal' aspect of these is on point.