Your backyard is the neighborhood favorite now that you've got that trampoline. Keep all the kids safe by installing the 33 Inch Trampoline Pole Foam sleeves - Fits 1 in. Posts. These sleeves come sets of 12 or 16 and are made of super durable 1-inch thick premium EVA foam. A full 33-inches long, these foam sleeves fit 1-inch trampoline posts and provide peace of mind.