The Bostock safety stirrup are a superb design which are made to come apart in the middle and not 'break'. Once the rider reaches 'the point of no return', the bottom half of the stirrup will come apart from the top. Therefore, greatly reducing the risk of being dragged. They are designed to only come apart in a high intensity fall and should not come away during an 'every day fall'.
They are easy to put back together once they come apart. Just simply line up the arrows and click the two parts together.
They are designed for use in all disciplines and are approved in BE.
Fun Fact: They were tested and tried for 7 years before being available on the market to ensure that they were the best that they could be. They are also believed to be the first safety stirrup that will completely break away and can be used in all disciplines.