These straps are made from 50mm (2") wide polypropylene webbing with a quick release buckle sewn on one end. The quick release buckle is a buckle which separates into two when you squeeze the two handles on the sides. In addition, the non-sewn end functions like a ladderlock buckle which uses a highly angled bar to control the movement of the webbing. It is very easy to tighten the strap and once released, the webbing will be retained by the buckle. You then lift the buckle up to release the webbing. These come with an optional triglide retaining buckle which can be ued to tidy up the free end and to ensure the webbing does not slip.