These are Cl AS roller ski boots from Alpina. They are specifically made for warmer weather conditions, as they feature well-ventilated fabrics. So you can continue your training during the warmer months with more comfortable feet. With a flexible forefoot and a low cuff, that enables you to kick backwards, these Alpina boots are perfect for classic roller skiing. The boot is compatible with the NNN/NIS, Turnamic and Prolink binding systems.