The Marker Duke PT 12 can be used on the resort as well as back country/uphill skiing. It is designed to have the performance of a Marker Squire, and also have the uphill comfort and capabilities of a pin binding. When skinning uphill, the toe piece is able to detach from the binding. This allows the user to have less weight on the ski decreasing the amount of time it takes to get uphill. Then when you get to the summit, pop them back on and your ready to ski downhill. This binding has a DIN range of 4-12.Thank you for shopping with us! We are happy to help with any questions you have, call us at 8PROSKIGUY (877-675-4489).