Thermo Saddles - 10101 - 10105 Thermo saddles provide an easy way to eliminate pinching and compression of insulation in flexible duct installation. They can be used individually or linked together to fit any duct diameter meaning one size fits all. Features: - Eliminates Pinching. - Eliminates Compression of Insulation. - Provides greater R-value. - Increased airflow. - One size fits all. - Use individually or linked.