Fits all Carefree slideout products and Dometic/A&E Slidetoppers. Made of long lasting heavy-duty vinyl. Nylon webbing is sewn into the fabric around the polycord that slides into the awning rail.This extra reinforcement prevents the canopy from ripping or tearing at the seam due to wind flapping or water pooling - typically the number one reason for slideout canopy damage. (Size refers to actual canopy length.)