This is a fully enclosed one piece infant seat that helps prevent small children from falling out. The dimensions of the seat are 39” circumference, 9.5” deep, the front leg opening is 5” leg with the back opening 4.75”. It is made with a steel insert that is encased in 70duro EPDM rubber with heavy duty rust resistant welded triangular hardware. EPDM: Ethylene-propylene-diene-monomer is a synthetic rubber material which helps prevent crazing, cracking and oxidizing. Natural rubber is often made from recycled tires etc., and you are never sure what the actual rubber mixture is. It often wears off on children’s clothes. It cracks and crazes, making the seat unsightly and allowing moisture to get into the seat. This makes the seat deteriorate at a much quicker rate. Our seats are made of EPDM rubber that is made especially for our swing seats. The rubber does not rub off on children’s clothes, and the seats last much longer than natural rubber swings. Unlike seats made of polymer, seats made of EPDM rubber hold up well in extreme temperatures, both very hot and very cold. Our one piece steel insert is not used in most other swing seats either. Making a one piece insert is much more expensive than tabbing an insert together because of the waste that is caused. However, we feel that the strength of the seat is greatly increased and warrants the expense. Our seats have galvanized steel triangles and steel plates that are riveted to the seat with galvanized rivets. We go to the added expense of welding each triangle together so they cannot be pulled apart and pulled off the seat. We believe our swings are one of the few that have these welded triangles. The triangle is constructed of 3/8” dia. cold rolled steel with the ends welded together. The plate is 1/16” thick h.r. stamped galvanized steel. The rivets which are used to rivet the plate through the EPDM rubber and steel insert are made of ¼” diameter steel. There are three rivets on each side of the seat. The S100 toddler seat has a 1075 steel insert, full hard, painted with a non-rusting adhesive, and then coated with rubber that is from ¼” to 3/8” thick. This is a new innovation by our company, not offered by other companies, which helps prevent a child from being cut if the rubber is ever torn off a seat. We believe our seats are made to the highest standards available. Customers cannot see many of the extra hidden safety features. Uninformed users may think our seats and another suppliers are the same. However, they may not have added the hidden safety features that we have because of the added costs. We feel these safety features benefit the strength of our swings and the well-being of the children that use our equipment. The seat should last 2 years in harsh conditions and up to 5 years in optimal conditions. Some conditions may require replacement sooner. Tensile strength is 5300 lbs.