A stop loss limit order allows you to limit your losses from an open position. Similar to a stop loss market order, you can set a stop price that, when reached, triggers the submission of a limit order that closes your position.
The limit price you set represents the worst possible price at which your order can be matched. Depending on the distance between the Stop price and Limit price it can either execute immediately as a taker order be placed on the order book.
The price trigger setting by default is the mark price, but can optionally be changed to trigger on the last trade price or index price.