Trampolines come in three basic shapes - square, rectangular and round -- and many different sizes. While choosing a trampoline, you should consider its durability and safety as well as its guarantee. Pay close attention to the frame pads, jumping mats, springs and frames.

The frame pad is the most important part of the trampoline. Good frame pads provide better protection. Look at the thickness, width and the quality of material used in making the frame pad while choosing a trampoline.

The next component to closely inspect is the jumping mat. Make sure it is properly stitched and capable of withstanding an adult's weight. There are several grades of jumping mats sold on the market today. The better the mat, the longer it will last.

Look at the quality of the springs as the longer the spring, the better the bounce. See if they are likely to weaken or stretch out of shape after use.

The frame should also be sturdy enough to withstand weight of more than one person, because often more than one child uses the trampoline simultaneously. A good trampoline frame should never bend or bow when set up, nor flex when in use.

Best way to find an authentic manufacturer and supplier of a trampoline that meets international safety standards is to visit the International Trampoline Industry Association (ITIA), a non-profit trade association of manufacturers, suppliers, and distributors of trampolines, trampoline parts and related equipment.

Here are some of the leading trampoline manufacturers and suppliers listed by the ITIA: Eurotramp, Trampoline Authority, 1800Trampoline.com, Hedstrom - Ball, Bounce and Sport Inc., Soft-Bounce Needak Rebounders, JumpSport, and Super-Fun Trampolines.