These are RSK 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 high cuff and a stiff boot sole to support your sidewards push offs, these Alpina boots are perfect for skate roller skiing. The boot is compatible with the NNN/NIS, Turnamic and Prolink binding systems.