Upgraded Triple Layer Bottom : More durable and wear-resistant than the original one-layer snow tube offering you a speedy and safer ride. Double-locking Valve makes fast inflation/ deflation and ensures air seal tightly; Advanced seamless bonding technology is adpoted to prevent leaks. Double reinforced grab handles are sturdy enough to avoid tearing issue and provide comfortable handling with glove on. Enjoy winter fun with snow tubes more safe! Scratch-resistant and wear-resistant material can withstand extreme cold temperatures up to minus 40 degrees allowing you to have a fast and smooth slide experience. Larger size and deeper seat can withstand pressures up to 500 lbs designed for both adult and kids to have comfortable and safe seating. Notice: Beware of dangerous obstacles especially on icy snow or hard pack. Beware this product can develop high speeds under snow conditions. This is not a towable device. Never tow from behind any vehicle. Competent adult supervision suggested. NOTE: A small hole in the bottom is not defective but for exhaust between the gap of two layers.