The Convertible Concave Tube from Connelly is designed to ensure a safe and comfortable ride â€" without skimping on the fun. Its concave top deck is shaped with a low centre of gravity, keeping you steady, while 8 fully padded handles provide extra grip, and two soft EVA foam pads make sure you're comfortable. The tube also includes a Boston valve for easy inflation, and a quick connect tube rope attachment, so you can get up and running in no time.