These are PRO Cl Summer 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 Prolink, Prolink Shift, Rottefella NIS 2.0 and Rottefella NIS 3.0 binding systems.