100% Blackout: Made of 100% polyester material with reinforced thermal insulation coating, these fabrics feel soft and smooth. They are free from burrs, resistant to wear, and easy to clean. Our blackout blinds block 100% of sunlight and UV rays. The thermal backing reduces heat loss and cold transfer through windows in both winter and summer, helping to lower your energy bills. Free-Stop System: The cordless design is safer for children and pets. They feature a robust spring-loaded mechanism that has passed 5,000 times of lifting and pulling tests for each blind.