Ratchet straps are heavy-duty tie-downs used to secure cargo during transport. They consist of a long, durable strap with a ratcheting mechanism that allows for easy tightening. The strap is typically made from polyester, which is strong and resistant to wear and tear. To use a ratchet strap, one end is attached to a fixed point, while the other end is threaded through the ratchet mechanism. By pulling the strap and operating the ratchet, users can achieve a tight hold on their load, preventing shifting or damage during transit.