DogHelios Trail-Barker Multi-Surface Travel Dog Bed Featuring BlackShark Technology Features Helios "Black Shark" technology making this pet bed impermeable, waterproof, windproof while retaining heat and keeping you cool Zips open via the side zippers and doubles in size! These dog beds feature connectable zippers; Multiple of these beds can connect together for a wider surface Contains PU water repellent coating and wear-resistant, Perfect for indoor / outdoor usage Features nylon carrying strap; Available in multiple colors