Moss Hollow Adventure tunnels keep your pet active and entertained. The tunnels may be expanded and configured as you desire, and provides a spot for your pet to explore while also offering security and comfort. Satisfies your pet's instincts to burrow & hide Promotes exercise & exploring Expands over 2.5 feet! Sizes (Approximate): Small: Collapsed: 8" x 4" (20cm x 10cm) Expanded: 35" x 4" (89cm x 10cm) Medium: Collapsed: 8" x 6" (20cm x 15cm) Expanded: 35" x 6" (89cm x 15cm)