A trampoline has a side frame supported by support legs, multiple fiberglass guardrail poles joined to the side frame or the support legs, and a guardrail netting held open by the guardrail poles. Each guardrail pole includes two fiberglass rods joined together by a connector that includes two nested securing tubes, where two respective ends of the two fiberglass rods are inserted in the internal securing tube. The external securing tube is secured outside of the internal securing tube. The guardrail netting has multiple securing fabric sleeves stitched to its top end. Each sleeve has a first part with a sealed top and a width matching that of a wider top section of the fiberglass guardrail pole, and a second part connected to the first part with a width matching that of the fiberglass guardrail pole, where the second part has a gap in the middle.