TREE SWING STRAPS MADE FROM CLIMBING MATERIAL WEBBING. This is what climbing harnesses are made out of because the material is so sturdy and durable. Carefully crafted knots are the magic behind the reliability of these straps - the more weight and pressure that is put on the knots - the tighter they get! Our unique O-ring set up allows you to thread the small O-ring through the larger O-ring and set your straps with this original and reliable method. Its so easy to set up - all you need is a great branch, bar, swing set frame, etc. A huge bonus is that they are portable! Even though the knots get tighter the more you swing, you can simply take these off by pulling the small O-ring end back through the big O-ring end and move them. Safe for trees! If you attach these to a tree, unlike some designs that eventually choke off branches, the loops in these original straps will expand with limb growth - allowing your tree to thrive. Since most tree branches arent horizontal these will adapt, you can adjust by wrapping straps around the branch as many times as needed to shorten or lengthen the strap. These durable straps will give you peace of mind. Proudly made in the USA with great care, one strap at a time.