The Align-Pilates Frame Sitting Box is slightly smaller than our standard Sitting Box, making it a perfect fit for smaller reformer carriages like those on the earlier C-Series, F-Series, and H-Series models. This box enhances your Pilates reformer by facilitating new exercises and improving comfort for seated and prone positions. It features EVA foam padding covered with abrasion-resistant vinyl and weighs approximately 7 kg, making it lightweight and easy to maneuver with its open sides design. Compatible with all brands of Pilates reformers.