Planning on getting a custom slider from us? Great! Most parachutes have different size sliders, so sending us the correct dimensions is important to make sure your wing retains the manufacturer's desired performance. Pulling your slider taut (but without stretching it) measure length and width across the center, not along the edges. Shown here is a 23"x31" collapsible slider, however we measure removable sliders the same way. That's all there is to it!