Sonik Xtractor Folding Sling The Xtractor Folding Sling is perfect for transporting your next catch with ease and is ideal for carp and coarse anglers thanks to the extremely durable polyester material. The net bottom of the Folding Sling is very soft to protect the fish and at the same time allows the water to drain away quickly. This means that the fish can be weighed or released directly without any deviations. Material: 100 % polyester.