The 236" x 71" size is the only size that can be extended to both sides: Material Polyester, Aluminum, Metal Color Gray Size Size 118" x 71"; Size 138" x 71"; Size 157.5" x 71"; Size 236" x 71";  Assembly Required  Yes Style Modern Fabric Type Polyester Functions UV Protection, Sunshade, Waterproof, Barrier, Privacy Protection Product Dimensions 118" x 71" Size: 3.5"D x 118"W x 71"H138" x 71" Size: 3.5"D x 138"W x 71"H157.5" x 71" Size: 3.4"D x 157.5"W x 71"H236" x 71" size: 3.5"D x 236"W x 71"H Single-sided Stretchable Size 118" x 71"; 138" x 71"; 157.5" x 71"; Double-sided Stretchable Size 236" x 71"