The Pet Life Capacious Expandable wire folding lightweight collapsible crate is composed of heavy-duty Ballistic Nylon and Mesh with bendable yet sturdy built-in flexible extenders that Velcro into place and hold up the 2 outer mesh expandable sides. Fully expands on both sides and collapses and folds. Perfect for multiple pets. Lightweight and great for traveling and indoor or outdoor usages. Features a spacious frontal breathable mesh entrance that rolls up and Velcro's into place, great for added sunlight visibility and exposure when opened with a back mesh window. Features dual reinforced stitching for added durability. Comes with an included reversible plush inner cushion that extends to cover the full surface area. SIZING DIMENSIONS: (INCHES) LxWxH: SIDES CLOSED: XS: 19 x 14 x 14, SM: 23 x 16 x 16, MD: 27 x 21 x 21, LG: 32 x 23 x 23, XL: 35 x 24 x 24. SIDES OPENED: XS: 19 x 35 x 14, SM: 23 x 39 x 16, MD: 27 x 55 x 21, LG: 32 x 62 x 23, XL: 35 x 67 x 24.